( a²+b²) (-a²+b²)Using identity(x+a)(x+b) = x²+(a+b)x+abx = a² , -a²a = b²b = b²

( a²+b²) (-a²+b²)Using identity(x+a)(x+b) = x²+(a+b)x+abx = a² ,

1.	( a²+b²) (-a²+b²)Using identity(x+a)(x+b) = x²+(a+b)x+abx = a² , -a²a = b²b = b²
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