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Tohaina

a^{2}-1^{2}-2\left(a-1\right)
Whakaarohia te \left(a+1\right)\left(a-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}.
a^{2}-1-2\left(a-1\right)
Tātaihia te 1 mā te pū o 2, kia riro ko 1.
a^{2}-1-2a+2
Whakamahia te āhuatanga tohatoha hei whakarea te -2 ki te a-1.
a^{2}+1-2a
Tāpirihia te -1 ki te 2, ka 1.
a^{2}-1^{2}-2\left(a-1\right)
Whakaarohia te \left(a+1\right)\left(a-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}.
a^{2}-1-2\left(a-1\right)
Tātaihia te 1 mā te pū o 2, kia riro ko 1.
a^{2}-1-2a+2
Whakamahia te āhuatanga tohatoha hei whakarea te -2 ki te a-1.
a^{2}+1-2a
Tāpirihia te -1 ki te 2, ka 1.