Tīpoka ki ngā ihirangi matua
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Tohaina

12a^{2}-36ab-21ba+63b^{2}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 4a-7b ki ia tau o 3a-9b.
12a^{2}-57ab+63b^{2}
Pahekotia te -36ab me -21ba, ka -57ab.
12a^{2}-36ab-21ba+63b^{2}
Me hoatu te āhuatanga tohatoha mā te whakarea ia tau o 4a-7b ki ia tau o 3a-9b.
12a^{2}-57ab+63b^{2}
Pahekotia te -36ab me -21ba, ka -57ab.