Question

solve using identity (2x+3) (2x-5)

Answer 1

(2x+3)(2x-5)
= (2x+3)[2x+(-5)]
= (2x)^2 + [3+(-5)]*(2x) + 3*(-5)
= 4x^2 - 4x - 15

Answer 2

$\huge{\underline{\bf{ANSWER}}}$

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$<b><i>FACTORISE :<i><b>$

( 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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#BE BRAINLY