Untuk fungsi f(x) = x² + 2x-6, tentukan: a. f(6) b. f(-5) c. f(a) d. f(a + 1)
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f(x) = x² + 2x - 6
a. f(6) = 6² + 2(6) - 6
= 36 + 12 - 6
= 42
b. f(-5) = (-5)² + 2(-5) - 6
= 25 - 10 - 6
= 9
c. f(a) = a² + 2a - 6
d. f(a + 1) = (a + 1)² + 2(a + 1) - 6
= (a² + 2a + 1) + (2a + 2) - 6
= a² + 2a + 1 + 2a + 2 - 6
= a² + 2a + 2a + 1 + 2 - 6
= a² + 4a - 3
Semoga membantu.
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