factorise a4 + a2b2 + b4
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Find the formula required first a2+2ab+b2=(a+b)2
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= a⁴ + a²b² + b⁴
= a⁴ + a²b² + b⁴ - 2a²b² + 2a²b²
= (a² + b²)² - 2a²b² + a²b²
= (a² + b²)² - a²b²
= (a² + b²)² - (ab)²
Now it's in the form of a² - b² = (a + b)(a - b)
(a² + b² + ab)(a² + b² - ab)
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