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x diganti -4
(-4)² - 2a(-4) - 6a + 8 = 0
16 + 8a - 6a + 8 = 0
24 + 2a = 0
2a = -24
a = -12
x² + 24x + 80 = 0
(x + 20((x + 4) = 0
x = -20 ATAU x = -4
(-4)kuadrat-2a(-4)-6a+8=0
16+8a-6a+8=0
2a+24=0
2a=-24
a=-12
a=-12 => x kuadrat-2ax-6a+8=0
x kuadrat-2(-12)x-6(-12)+8=0
x kuadrat +24x+72+8=0
x kuadrat+24x+80=0
(x+20)(x+4)=0
x=-20 / x=-4