evaluate using suitable identity (I) (2x+3y)² (ii) (2x-3y)² (iii) (2x+3y)(2x-3y) (iv) (2x+7) (2x+5)
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Step-by-step explanation:
(1) (2x+3y)²=(2x)²+(3y)²+2(2x)(3y)
=4x²+9y²+12xy
(2) (2x-3y)²=(2x)²+(3y)²-2(2x)(3y)
=4x²+9y²-12xy
(3) (2x+3y)(2x-3y)=2x²-3y²
4th one is the wrong question please correct it!
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