Find the square of m² + n²
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(m²+n²)²
Using identity 1 (a+b)² = a²+2ab+b²
a=m²
b=n²
(m²+n²)²= (m²)²+2×m²×n²+(n²)²
(m²+n²)²= m⁴ +2m²n²+n⁴
∴ square of m²+n² is m⁴ +2m²n²+n⁴.
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Using identity 1 (a+b)² = a²+2ab+b²
a=m²
b=n²
(m²+n²)²= (m²)²+2×m²×n²+(n²)²
(m²+n²)²= m⁴ +2m²n²+n⁴
∴ square of m²+n² is m⁴ +2m²n²+n⁴.
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