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x * 2x - 6 = 2x² - 6
mungkiin
x(2x - 6) = 0
maka
x = 0
2x - 6 = 0 ⇒ 2x = 6 ⇒ x = 3
Nomer b
x² - 19x + 18 = 0
⇒ (x - 1)(x - 18) = 0
Maka
x - 1 = 0 ⇒ x = 1
x - 18 = 0 ⇒ x = 18
Terimakasih semoga membantu