Question
Solve:
$25 x^4 y^4-1$
$25 x^4 y^4-1$
✓
Answer
$25 x^4 y^4-1$
$=\left(5 x^2 y^2\right)^2-1$
$=\left(5 x^2 y^2-1\right)\left(5 x^2 y^2+1\right)$
$=\left(5 x^2 y^2\right)^2-1$
$=\left(5 x^2 y^2-1\right)\left(5 x^2 y^2+1\right)$
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