How do you evaluate the expression $2 x^{2} + 3 x + 9$ $2x^2+3x+9$ if x=-3?

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How do you evaluate the expression $2 x^{2} + 3 x + 9$ $2x^2+3x+9$ if x=-3?

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Answer 1 · 2016-12-06T23:19:18

$18$ $18$

Explanation:

You substitute $- 3$ $-3$ for every occurrence of $x$ $x$ in the expression and then calculate the result. Be sure to handle the signs of numbers correctly:

$2 (- 3^{2}) + 3 (- 3) + 9 \to$ $2(-3^2) + 3(-3) + 9 ->$

$(2 \cdot 9) - 9 + 9 \to$ $(2*9) - 9 + 9 ->$

$18 - 0 \to$ $18 - 0 ->$

$18$ $18$

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How do you evaluate the expression $2 x^{2} + 3 x + 9$ $2x^2+3x+9$ if x=-3?

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How do you evaluate the expression $2 x^{2} + 3 x + 9$ $2x^2+3x+9$ if x=-3?