Question

if 3 is a zero of the polynomial x^2+2x-a. find the value of a​

Answer 1

Answer:

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Answer 2

$p(x) = {x}^{2} + 2x - a \\ p(3) = ( {3)}^{2} + 2(3) - a \\ = 9 + 6 - a \\ = 15 - a \\ a = 15$