Whakaoti mō x
x=-8
Graph
Tohaina
Kua tāruatia ki te papatopenga
2x-\left(-20\right)=-2\left(-2\right)
Whakareatia te 4 ki te -5, ka -20.
2x+20=-2\left(-2\right)
Ko te tauaro o -20 ko 20.
2x+20=4
Whakareatia te -2 ki te -2, ka 4.
2x=4-20
Tangohia te 20 mai i ngā taha e rua.
2x=-16
Tangohia te 20 i te 4, ka -16.
x=\frac{-16}{2}
Whakawehea ngā taha e rua ki te 2.
x=-8
Whakawehea te -16 ki te 2, kia riro ko -8.
Ngā Tauira
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{ x } ^ { 2 } - 4 x - 5 = 0
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