plzzz ans...factorise ....thnk u
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(a + b)²/4 - 9(2a - b)²/16
= (a + b)²/(2)² - 3²(2a - b) ²/(4)²
={ (a + b)/2}² - {3(2a - b)/4}²
use formula ,
x² - y² = (x - y)(x + y)
= { (a + b)/2 + 3(2a - b)/4}{(a + b)/2 - 3(2a -b)/4}
={ (2a + 2b + 6a - 3b)/4 }{(2a + 2b -6a + 3b)/4}
={ ( 8a -b)/4}{(5b - 4a)/4}
= (8a - b)(5b - 4a)/16
= (a + b)²/(2)² - 3²(2a - b) ²/(4)²
={ (a + b)/2}² - {3(2a - b)/4}²
use formula ,
x² - y² = (x - y)(x + y)
= { (a + b)/2 + 3(2a - b)/4}{(a + b)/2 - 3(2a -b)/4}
={ (2a + 2b + 6a - 3b)/4 }{(2a + 2b -6a + 3b)/4}
={ ( 8a -b)/4}{(5b - 4a)/4}
= (8a - b)(5b - 4a)/16
sanj2:
plzzzx ans my other question
tommorow is my exam
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