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15 votes
15 votes
F (x)=-4x^2+9 find f(-3)​

User Samet
by
2.6k points

2 Answers

12 votes
12 votes

Answer:

-27

Explanation:

to find f(-3) we must substitute x to -3 in the f(x)= -4x² +9

f(-3) = -4(-3)² +9

f(-3) = -4*9 +9

f(-3) = -36 +9

f(-3) = -27

User Szpic
by
2.9k points
24 votes
24 votes

Answer:


f(x) = - 4 {x}^(2) + 9 \\ \\ f( - 3) = - 4 ({ - 3}^(2) ) + 9 \\ = -4 (9) + 9 \\ = - 36 + 9 \\ = - 27

I hope I helped you^_^

User Randell
by
2.3k points