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Tohaina

25\left(1-4f^{2}\right)
Tauwehea te 25.
\left(1-2f\right)\left(1+2f\right)
Whakaarohia te 1-4f^{2}. Tuhia anō te 1-4f^{2} hei 1^{2}-\left(2f\right)^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(-2f+1\right)\left(2f+1\right)
Whakaraupapatia anō ngā kīanga tau.
25\left(-2f+1\right)\left(2f+1\right)
Me tuhi anō te kīanga whakatauwehe katoa.