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Visual zero gradient

Problem

Here's the graph of the scalar field f, left parenthesis, x, comma, y, right parenthesis, equals, minus, x, cubed, plus, start fraction, y, squared, divided by, 3, end fraction, plus, start fraction, x, divided by, 2, end fraction, where minus, 1, is less than, x, is less than, 1 and minus, 1, is less than, y, is less than, 1.
How many points left parenthesis, x, comma, y, right parenthesis within the graphed range have a zero gradient with f?
Choose 1 answer:
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