Question

F(-4) - f(1) if f(x) = -x²+ 8x -11

Answer 1

f(x) = -x² + 8x - 11

f(-4) = -(-4)² + 8(-4) - 11

= -16 - 32 - 11

= -59

f(1) = -1² + 8(1) - 11

= -1 + 8 - 11

= -4

f(-4) - f(1) = -59 - (-4) = -59 + 4 = -55