Question

Tolong kerjain soal ni

Answer 1

2.
( f+g ) (x) = (2x-5) + (x²+3x)
( f+g ) (x) = x² + 5x - 5
( f+g ) (3) = 3² + 5(2) - 5
( f+g ) (3) = 9 + 10 - 5
( f+g ) (3) = 14

3.
f (x) = -x + 3
tentukan ... f(x²) + (f(x))² - 2f(x)
= (-x² + 3) + (-x + 3)² - 2(-x + 3)
= (-x² + 3) + (-x + 3)(-x + 3) - (-2x + 6)
= (-x² + 3) + (x² - 3x - 3x + 9) - (-2x + 6)
= -x² + 3 + x² - 6x + 9 + 2x - 6
= -4x - 6