factorise (3x+5y)2 - (3x-5y)2
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Answer:
60xy
Step-by-step explanation:
suppose 3x+5y = a
and 3x-5y = b
a²-b²
= (a+b)(a-b)
= (3x+5y+3x-5y)(3x+5y-3x+5y)
= 6x*10y
= 60xy
using formula : x²-y² = (x+y)(x-y)
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