https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/v/what-is-a-function 2021-06-30T18:10:09Z What is a function? Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. Sal Khan video https://cdn.kastatic.org/googleusercontent/whRX1xQJEDdGcWfqUl8w5525C24vlDY-jZPlw-V9OTDxzG7Adv25nPLwbaP1FKUH4HK6R7YTRYoSCB9n4fLieb7A What is a function? Functions assign a single output for each of their inputs. In this video, we see examples of various kinds of functions. https://cdn.kastatic.org/ka-youtube-converted/kvGsIo1TmsM.mp4/kvGsIo1TmsM.mp4 477 Concepto de función https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/v/understanding-function-notation-example-1 2021-06-30T18:10:08Z Worked example: Evaluating functions from equation Learn how to evaluate f(x)=49-x² at x=5. Sal Khan video https://cdn.kastatic.org/googleusercontent/03JkypsEnHQbMacEEnDhM2q7NzHC0H8z9r5kzGCVuoZU6lPVF8p6FjvFPLQR4CeQfKoJkRVn0ROCTWHfZTMhBDST Worked example: Evaluating functions from equation Learn how to evaluate f(x)=49-x² at x=5. https://cdn.kastatic.org/ka-youtube-converted/Id6UovYjd-M.mp4/Id6UovYjd-M.mp4 59 Concepto de función https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-linear-equations-functions/8th-functions-and-function-notation/v/understanding-function-notation-example-3 2021-06-30T18:10:16Z Function notation example Sal uses function notation to help Frank figure out how much water he can put in his balloon. Sal Khan video https://cdn.kastatic.org/googleusercontent/oNjD7Dv--hK2DJlEu67CCpR9_dkE7wWX-rBzRSgtq8uLVOXIWUeZX4NHm4hKIU0xRjW4_ZtU5Z0Yane9Iiz_wCm1 Function notation example Sal uses function notation to help Frank figure out how much water he can put in his balloon. https://cdn.kastatic.org/ka-youtube-converted/IXRMVcoqRRQ.mp4/IXRMVcoqRRQ.mp4 133 Concepto de función https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/e/functions_1 2026-03-24T23:41:07.080866137Z Evaluate functions Evaluate functions for specific inputs given the formula of the function.  Functions are written using function notation. Tomer Gal exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:evaluating-functions/v/understanding-function-notation-example-2 2021-06-30T18:10:10Z Worked example: Evaluating functions from graph Evaluating a function at x=-1 using the graph of that function. Sal Khan video https://cdn.kastatic.org/googleusercontent/rut742_LAfXpdb93Uk5lXue9m1yQuXStNvQkA3Ts6i_NZSMPTq2v6e4uPyFb9qkdLHy_pI1Jfzhg_aILSJVs9aYq Worked example: Evaluating functions from graph Evaluating a function at x=-1 using the graph of that function. https://cdn.kastatic.org/ka-youtube-converted/kzYtx_AqzjM.mp4/kzYtx_AqzjM.mp4 44 Concepto de función https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-linear-equations-functions/8th-functions-and-function-notation/e/evaluate-functions-from-graph 2026-03-25T20:00:51.494577527Z Evaluate functions from their graph Evaluate functions for specific inputs given the graph of the function. Lindsay exercise https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:functions/x2f8bb11595b61c86:functions-and-equations/v/difference-between-equations-and-functions 2021-06-30T18:10:09Z Equations vs. functions Equations and functions are not the same thing, but they can be related in several ways. Watch Jesse Roe and Sal talk about the difference between equations and functions Sal Khan video https://cdn.kastatic.org/googleusercontent/_SP6Z0ZojobmwUjesasgEIFIaGMT7_zcEJh29GwRKFy0jHOihhhUI_kb-rMiZGErLXeiltjt9ltH3XO51uJofPrgAg Equations vs. functions Equations and functions are not the same thing, but they can be related in several ways. Watch Jesse Roe and Sal talk about the difference between equations and functions https://cdn.kastatic.org/ka-youtube-converted/l3iXON1xEC4.mp4/l3iXON1xEC4.mp4 258 Concepto de función https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:modeling/x2ec2f6f830c9fb89:manipulating-formulas/v/solving-for-a-variable-2 2021-06-30T18:10:05Z Manipulating formulas: temperature Sal takes the formula for converting from Fahrenheit temperature to Celsius, and solves it for F so it serves to convert from Celsius to Fahrenheit. Sal Khan video https://cdn.kastatic.org/googleusercontent/SHRO-zfXpAhYG7nntQGM0Fkbsjm1zrKHZPGS8q7tFL_SAwULEMdbHroU3ok8HpzYtTUAc9sWbpmPIycHOSG3H4zw9w Manipulating formulas: temperature Sal takes the formula for converting from Fahrenheit temperature to Celsius, and solves it for F so it serves to convert from Celsius to Fahrenheit. https://cdn.kastatic.org/ka-youtube-converted/BR5yFOt0zao.mp4/BR5yFOt0zao.mp4 161 Concepto de función