Answers

2014-12-07T12:06:44+05:30
A.  (2a+3)(2a+5)
     = (2a)² + 3*5 + 2a(3+5)
     =4a² + 15 + 16a

B.  (3p-4q)(3p+4q)
     = (3p)² - (4q)²
     = 9p² - 16q²
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excuse me! ur second answer is wrong. u had copied the question incorrectly. please correct it
what is the aljebraic identity
2014-12-07T12:30:15+05:30
1) (2a+3)(2a+5)
=2a(2a+5)+3(2a+5)
=4a
²+10a+6a+15
=4a
²+16a+15

2)  (3p-4q)(3p-4q)
=3p(3p-4q)-4q(3p-4q)
=9p²-12pq-12pq+16q²
=9p²-24pq+16q²
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