factorise (ax +by)² +(bx-ay)²
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Step-by-step explanation:
( ax+by )²+ ( bx-ay )²
a²x²+b²y²+2abxy+b²x²+a²y²-2abxy
a²x²+b²x²+b²y²+a²y²
x²(a²+b²)+y²(a²+b²)
(a²+b²)(x²+y²)
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