Mohon bantuan nya kawan2 semuanya,terimakasih
3. (f°g)(x) = f(g(x))
= f(x²+2)
=(x²+2)² – (x²+2) – 6
= x^4 + 4x² + 4 – x² -2 -6
= x^4 + 3x² – 4
(g°f) (x) = g(f(x))
= g ( x² – x -6)
= ( x² – x -6)² + 2
= x^4 – 2x³ – 5x² – 6x + 36
(g°f) (1)= 1 – 2 (1) – 5 (1) – 6(1) + 36
= 24
4. x² + 5x ≥ 2 ( 2x + 3 )
x² + 5x ≥ 4x – 6
x² + 5x – 4x – 6 ≥ 0
x² + x – 6 = 0
(x – 2) ( x +3)
x = 2 / x = -3