Factorise:
a raise to 4 + a² + 1
kvnmurty:
it is a^4
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a^4 + a² + 1
Adding and subtracting a²,
(a^4 + 2a² + 1) - a²
= (a² + 1)² - (a)²
[x² - y² = (x + y)(x - y). Here x = (a² + 1) and y = a]
= (a² + a + 1)(a² - a + 1)
Adding and subtracting a²,
(a^4 + 2a² + 1) - a²
= (a² + 1)² - (a)²
[x² - y² = (x + y)(x - y). Here x = (a² + 1) and y = a]
= (a² + a + 1)(a² - a + 1)
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