Whakaoti mō x
x=-1
Graph
Tohaina
Kua tāruatia ki te papatopenga
20=x+3\times 7
Whakareatia te 5 ki te 4, ka 20.
20=x+21
Whakareatia te 3 ki te 7, ka 21.
x+21=20
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
x=20-21
Tangohia te 21 mai i ngā taha e rua.
x=-1
Tangohia te 21 i te 20, ka -1.
Ngā Tauira
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{ x } ^ { 2 } - 4 x - 5 = 0
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\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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Whakarerekētanga
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