f(x) = 2x + 7x + x²
f(h) = 90
h = ...?![]()
f(h) = 90
h = ...?
Penjelasan dengan langkah-langkah:
f(x) = 2x + 7x + x²
f(h) = 90
f(h) = 2h + 7h + h²
h² + 9h = 90
h² + 9h – 90 = 0
(h + 15)(h – 6) = 0
h1 = –15
h2 = 6
f(–15) = (–15)² + 9(–15)
f(–15) = 225 – 135
f(–15) = 90
f(6) = 6² + 9(6)
f(6) = 36 + 54
f(6) = 90
Penjelasan dengan langkah-langkah:
f(x) = 2x + 7x + x²
f(h) = 90
2h + 7h + h² = 90
9h + h² = 90
(h + 15) × (h - 6) = 0
h + 15 = 0 atau h - 6 = 0
h1 = -15 atau h2 = 6
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