Question

Tentukan akar-akar persamaan kuadrat berikut:
A.x kuadrat - 12x + 20 = 0
B.3x kuadrat + 10x + 36 = 0
C.2x kuadrat + 7x = 5

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Answer 1

X² - 12x + 20 = 0
(x - 2)(x - 10) = 0
x - 2 = 0 atau x - 10 = 0
x = 2 atau x = 10

3x² + 10x + 36 = 0
a = 3
b = 10
c = 36


2x² + 7x = 5
x² + 7/2x = 5/2
x² + 7/2 x + 49/16 = 5/2 + 49/16
(x + 7/4)² = 89/16
x + 7/4 =
x = -7/4