find the value of the following expressions when x = - 2 5x^2+3x-9
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5x² + 3x - 9 = - 1, when x = - 2
Step-by-step explanation:
The given expression is
f(x) = 5x² + 3x - 9
When x = - 2, the value of f(x) is
f(- 2) = 5 (- 2)² + 3 (- 2) - 9
= 5 (4) + 3 (- 2) - 9
= 20 - 12 - 9
= 20 - 21
= - 1
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