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6x²+2x-20 = (3x - 5 ) (2x+4)
untuk x1 => 3x-5 = 0
3x = 5
x = 5/3
atau x2 => 2x+4 = 0
2x = - 4
x = - 2
rumus ABC
ket :
6x²+2x-20
,a= 6
b=2
c=-20
per = bagi (:)
<=> -b + √b²-4ac per (2a)
<=> -2 + √2²- 4 x 6 x -20 per (2 x 6)
<=> -2 + √4 - 24 x -20 per 12
<=> -2 + √4+280 per 12
<=> -2 + √484 per 12
<=> -2 + 22 per 12
jadi,
x1 = -2+22 per 12
= 20 : 12
= 5/3
atau
x2 = - 2 - 22 per 12
= - 24 : 12
= - 2