Question

The value of the polynomial 5x^2-3x+7 at x=-1

Answer 1

5 * -1 - 3* -1 +7

-5 +3 +7

= 9

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Answer 2

substituting value of X in the following equation

X = -1

p(X) = 5x²-3x+7

p(-1) = 5(-1)² - 3(-2) + 7

= 5 + 6 + 7

= 18