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9x² + 12x = 0
3x(3x + 4) = 0
x(3x + 4) = 0
Selesaian:
x = 0
Dan,
3x + 4 = 0 ⇒ x = -4/3
Didapat:
HP = {x | -4/3, 0}
Nomor 2.
x² - 64 = 0
(x+8)(x-8) = 0
Selesaian:
x+8 = 0 ⇒ x = -8
Dan
x-8 = 0 ⇒ x = 8
Didapat:
HP = {x | -8,8}
Nomor 3.
14x² - 21x = 0
7x(2x - 3) = 0
x(2x - 3) = 0
Selesaian:
x = 0
Dan,
2x - 3 = 0 ⇒ x = 3/2
Didapat:
HP = {x | 0, 3/2}
Nomor 4.
4x² - 16 = 0
4(x² - 4) = 0
x² - 4 = 0
(x+2)(x-2) = 0
Selesaian:
x + 2 = 0 ⇒ x = -2
Dan
x - 2 = 0 ⇒ x = 2
Didapat:
HP = {x | -2, 2}