Whakaoti mō x
x=0
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Tohaina
Kua tāruatia ki te papatopenga
x^{2}-4x+4-\left(x+1\right)\left(x-1\right)=5
Whakamahia te ture huarua \left(a-b\right)^{2}=a^{2}-2ab+b^{2} hei whakaroha \left(x-2\right)^{2}.
x^{2}-4x+4-\left(x^{2}-1\right)=5
Whakaarohia te \left(x+1\right)\left(x-1\right). Ka taea te whakareanga te panoni ki te rerekētanga o ngā pūrua mā te ture: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}. Pūrua 1.
x^{2}-4x+4-x^{2}+1=5
Hei kimi i te tauaro o x^{2}-1, kimihia te tauaro o ia taurangi.
-4x+4+1=5
Pahekotia te x^{2} me -x^{2}, ka 0.
-4x+5=5
Tāpirihia te 4 ki te 1, ka 5.
-4x=5-5
Tangohia te 5 mai i ngā taha e rua.
-4x=0
Tangohia te 5 i te 5, ka 0.
x=0
He ōrite te hua o ngā tau e rua ki 0 ina 0 tētahi o rāua te iti rawa. Tātemea kāore te -4 e ōrite ki 0, me ōrite pū te x ki 0.
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