Answer:
- 37
Step-by-step explanation:
Note (g - f)(x) = g(x) - f(x)
g(x) - f(x)
= - x² + 2x + 1 - ( 3x² + 5x - 7) ← distribute
= - x² + 2x + 1 - 3x² - 5x + 7 ← collect like terms
= - 4x² - 3x + 8
Thus
(g - f)(3) = - 4(3)² - 3(3) + 8 = - 4(9) - 9 + 8 = - 36 - 9 + 8 = - 37
Answer:
Solution given:
f(x) = 3x^2 + 5x – 7
g(x) = –x^2 + 2x+1
Step-by-step explanation:
now
(g-f)(x)=g(x)-f(x)=–x^2 + 2x + 1.-[3x^2 + 5x – 7]
=x²-3x²-5x+2x+1+7
=-2x²-3x+8
now.
(g-f)(3)=-2×3²-3×3+8=-18-9+8=-19
is your answer.
