Step-by-step explanation:
For each problem, plug in the values, then simplify.
g(x) = x² − 8x + 21
g(-5) = (-5)² − 8(-5) + 21
g(-5) = 25 + 40 + 21
g(-5) = 86
g(x) = x² − 8x + 21
g(x+4) = (x+4)² − 8(x+4) + 21
g(x+4) = x² + 8x + 16 − 8x − 32 + 21
g(x+4) = x² + 5
f(x) = -4x + 1
53 = -4x + 1
52 = -4x
x = -13
