For the function f(x) = -15x^4 +12, what is the value of f(x) when x=-2?
F. -228
G. -108
H. 132
J. 252

Question

solomonzelman · Answer

$\large\color{blue}{ \bf    f(x) = -15x^4 +12   }$    just giving couple examples.


$\large\color{blue}{ \bf    f(3) = -15(3)^4 +12=-15(81)+12=-1215+12=1203   }$

$\large\color{blue}{ \bf    f(-1) = -15(-1)^4 +12=-15(1)+12=15+12=27   }$

$\large\color{blue}{ \bf    f(-2) = ~~you~~~~tell~~~~me.  }$

anonymous · Answer

I know how to do it it's just that I don't have a calculator can you please give me the answer

solomonzelman · Answer

$$(-2)^4=16,~~~~~~~~~~~~(-15)(16)=-240.$$

anonymous · Answer

-240x=-24