Question

R(x) = -4x² + 5x1
r(-3) =?

Answer 1

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.

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

Answer 2

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

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