Evaluate 3x^2- 9 when x=-2
2 answers:
Answer:
3
Step-by-step explanation:
We know x = -2, so we can substitute -2 in for x
3x^2- 9
3*-2^2-9
Solve the exponent first (PEMDAS)
3*4-9
Multiply next
12-9
Subtract
3
Answer:
3
Step-by-step explanation:
3x^2- 9 =
= 3(-2)² - 9
= 3×4 - 9
= 12 - 9
= 3
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