Question

Evaluate the expression when x=-5. x² + 6x - 9

Answer 1

- 14

Explanation:

substitute x = - 5 into the expression

x² + 6x - 9

= (- 5)² + 6(- 5) - 9

= 25 - 30 - 9

= - 5 - 9

= - 14

Answer 2

-14

Explanation:

Step 1: Substitute x = -5

`\displaystyle{x^2+6x-9\to (-5)^2+6(-5)-9}`

Step 2: Evaluate

Keep in mind that negative times negative is positive and positive times negative is negative.

`\displaystyle{=(-5)(-5)+6(-5)-9}\\\\\displaystyle{=25-30-9}\\\\\displaystyle{=-14}`

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