Whakaoti mō x
x=-4
Graph
Tohaina
Kua tāruatia ki te papatopenga
20x-30-50x=90
Tangohia te 50x mai i ngā taha e rua.
-30x-30=90
Pahekotia te 20x me -50x, ka -30x.
-30x=90+30
Me tāpiri te 30 ki ngā taha e rua.
-30x=120
Tāpirihia te 90 ki te 30, ka 120.
x=\frac{120}{-30}
Whakawehea ngā taha e rua ki te -30.
x=-4
Whakawehea te 120 ki te -30, kia riro ko -4.
Ngā Tauira
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{ x } ^ { 2 } - 4 x - 5 = 0
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