Expand using suitable identities (2x+3)(2x+5)
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(2x+3)(2x+5)
(x+a)(x+b)= x*x+ (a+b)x+ab
2x*2x+(3+5)2x+(3)*(5)
4xsquare+16x+15
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Answered by
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FACTORISE :
( 2x + 3 ) ( 2x - 5 )
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USING IDENTITY :
( x + a ) ( x + b )
=> x² + x ( a + b ) + ab
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SOLUTION :
=> ( 2x )² + 2x ( 3 - 5 ) - ( 3 ) ( 5 )
=> 4x² + 2x ( - 2 ) - 15
=> 4x² - 4x - 15 ANS
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