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a^{2}-\left(2b\right)^{2}-\left(3a-2b\right)\left(3a+2b\right)
Whakaarohia te \left(a+2b\right)\left(a-2b\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}-2^{2}b^{2}-\left(3a-2b\right)\left(3a+2b\right)
Whakarohaina te \left(2b\right)^{2}.
a^{2}-4b^{2}-\left(3a-2b\right)\left(3a+2b\right)
Tātaihia te 2 mā te pū o 2, kia riro ko 4.
a^{2}-4b^{2}-\left(\left(3a\right)^{2}-\left(2b\right)^{2}\right)
Whakaarohia te \left(3a-2b\right)\left(3a+2b\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}-4b^{2}-\left(3^{2}a^{2}-\left(2b\right)^{2}\right)
Whakarohaina te \left(3a\right)^{2}.
a^{2}-4b^{2}-\left(9a^{2}-\left(2b\right)^{2}\right)
Tātaihia te 3 mā te pū o 2, kia riro ko 9.
a^{2}-4b^{2}-\left(9a^{2}-2^{2}b^{2}\right)
Whakarohaina te \left(2b\right)^{2}.
a^{2}-4b^{2}-\left(9a^{2}-4b^{2}\right)
Tātaihia te 2 mā te pū o 2, kia riro ko 4.
a^{2}-4b^{2}-9a^{2}-\left(-4b^{2}\right)
Hei kimi i te tauaro o 9a^{2}-4b^{2}, kimihia te tauaro o ia taurangi.
a^{2}-4b^{2}-9a^{2}+4b^{2}
Ko te tauaro o -4b^{2} ko 4b^{2}.
-8a^{2}-4b^{2}+4b^{2}
Pahekotia te a^{2} me -9a^{2}, ka -8a^{2}.
-8a^{2}
Pahekotia te -4b^{2} me 4b^{2}, ka 0.
a^{2}-\left(2b\right)^{2}-\left(3a-2b\right)\left(3a+2b\right)
Whakaarohia te \left(a+2b\right)\left(a-2b\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}-2^{2}b^{2}-\left(3a-2b\right)\left(3a+2b\right)
Whakarohaina te \left(2b\right)^{2}.
a^{2}-4b^{2}-\left(3a-2b\right)\left(3a+2b\right)
Tātaihia te 2 mā te pū o 2, kia riro ko 4.
a^{2}-4b^{2}-\left(\left(3a\right)^{2}-\left(2b\right)^{2}\right)
Whakaarohia te \left(3a-2b\right)\left(3a+2b\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}-4b^{2}-\left(3^{2}a^{2}-\left(2b\right)^{2}\right)
Whakarohaina te \left(3a\right)^{2}.
a^{2}-4b^{2}-\left(9a^{2}-\left(2b\right)^{2}\right)
Tātaihia te 3 mā te pū o 2, kia riro ko 9.
a^{2}-4b^{2}-\left(9a^{2}-2^{2}b^{2}\right)
Whakarohaina te \left(2b\right)^{2}.
a^{2}-4b^{2}-\left(9a^{2}-4b^{2}\right)
Tātaihia te 2 mā te pū o 2, kia riro ko 4.
a^{2}-4b^{2}-9a^{2}-\left(-4b^{2}\right)
Hei kimi i te tauaro o 9a^{2}-4b^{2}, kimihia te tauaro o ia taurangi.
a^{2}-4b^{2}-9a^{2}+4b^{2}
Ko te tauaro o -4b^{2} ko 4b^{2}.
-8a^{2}-4b^{2}+4b^{2}
Pahekotia te a^{2} me -9a^{2}, ka -8a^{2}.
-8a^{2}
Pahekotia te -4b^{2} me 4b^{2}, ka 0.