Question

r(x) = -4x² + 5x1
r(-3) =?

Answer 1

Answer:

therefore when x = -3, r(x) = -51

Step-by-step explanation:

This is a function of r(x), so when it says r(-3), the x value is -3, so we have to find the value of r(x) when x=-3.

just plug in the x value in to the given equation

r(-3) = $-4(-3)^{2}$+5(-3)

r(-3) = -4(9)+5(-3)

r(-3) = -36+-15

r(-3) = -51

therefore when x = -3, r(x) = -51

Answer 2

Answer:  r(x) = -51  

If the 1 is not a +1  or a -1    

It is very unusual to have a 1 in that position.

Step-by-step explanation:

Substitute the value given (-3) in place of x, and evaluate the function.

r(-3) = -4(-3)² + 5(-3)

r(-3) = -4(9) - 15

r(-3) = -36 -15

r(-3) = -51