Akar - akar persamaan kuadrat 2x² + 5x - 12 = 0 adalah :?.... Question from @HandySieghart

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HandySieghart @HandySieghart

October 2018 2 36 Report

Akar - akar persamaan kuadrat 2x² + 5x - 12 = 0 adalah :?

ThariqAG 2x^2+5x-12 = 0
kalikan koefisien a dengan c
jadi : x^2 + 5x -24 =0
(x-3/2) dan (x+8/2)
(2x-3) dan (x+4)

0 votes Thanks 2

RisaKhairani 2x² + 5x - 12 = 0
$x_{1.2} = \frac{-b\pm \sqrt{ b^{2}-4ac } }{2a} \\ = \frac{-5\pm\sqrt{ 5^{2}-4.2.-12 }}{2.2} \\ = \frac{-5\pm \sqrt{25+96} }{4} \\ = \frac{-5\pm \sqrt{121} }{4} \\ = \frac{-5\pm11}{4} \\ x_{1} = \frac{-5+11}{4} = \frac{6}{4} =1 \frac{1}{2} \\ x_{2} =\frac{-5-11}{4} = \frac{-16}{4} =-4$

3 votes Thanks 2