Question

Verify the following:
(1) (3x + 5y)2 – 30 xy = 9x2 + 25y2​

Answer 1

Answer

we use ,

( a+ b)^2 = a ^2 + b^2 + 2ab

= (3x + 5y)^2 - 30 xy

= 9x^2 + 25y^2 + 30xy - 30xy

= 9x^2 + 25y^2

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