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x² - 5x + 6 = 0
x1 + x2 = 5
x1.x2 = 6
Persamaan kuadrat baru:
x² - (x1 + x2)x + x1.x2 = 0
x² - 5x + 6 = 0
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Nomor 2
|7 - 2x| < 9
-9 < 7 - 2x < 9
-16 < -2x < 2
-1 < x < 8
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Nomor 3
f(3) = 2.3 + 1
= 6 + 1
= 7
g o f (3) = g(7)
= 7² - 2.7 + 1
= 49 - 14 + 1
= 34