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Add & subtract polynomials: two variables (intro)

Problem

Add.
Your answer should be a polynomial in standard form.
left parenthesis, 9, a, squared, plus, 8, a, b, minus, 7, b, squared, right parenthesis, plus, left parenthesis, 6, a, squared, minus, 5, a, b, minus, 4, b, squared, right parenthesis, equals
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Stuck?