SOLUTION: Can you help me evaluate this function? f(x) = -x^2 + 5 for 4 = x I get four different answers -9, -10, -11, -12 Which is right, and how do get it? Please help me,

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Can you help me evaluate this function? f(x) = -x^2 + 5 for 4 = x I get four different answers -9, -10, -11, -12 Which is right, and how do get it? Please help me,       Log On


   

Question 148972: Can you help me evaluate this function?
f(x) = -x^2 + 5 for 4 = x
I get four different answers -9, -10, -11, -12
Which is right, and how do get it?
Please help me,
Ellen
Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
Answer=-11
f(x) = -x^2 + 5 for 4 = x

-x^2 is the same as -1(x^2), so:

-1(x^2)+5
where x=4 would turn out as
-1(16)+5

Multiply
-16+5

Simplify
-11