Let f(x)=9x^2+6x-8, find f(-7)
f(x) = 9x^2 + 6x - 8
f(-7) = 9(-7)^2 + 6(-7) - 8
= 441 - 42 - 8
= 391
Much appreciated!!!
To find f(-7) using the given function f(x)=9x^2+6x-8, substitute -7 in place of x:
f(-7) = 9(-7)^2 + 6(-7) - 8
Start by simplifying the exponent:
f(-7) = 9(49) - 42 - 8
Multiply and subtract:
f(-7) = 441 - 42 - 8
Combine like terms:
f(-7) = 391 - 8
Finally, subtract:
f(-7) = 383
Therefore, f(-7) = 383.