factorise
81-49x square
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81 – 49x2 can be written as (9)2 – (7x)2 By using the formula a2 – b2 = (a+b) (a-b) Now solving for the above equation (9)2 – (7x) 2 = (9+7x) (9-7x)
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Algebra Examples
Rewrite 81 as 92 . Rewrite 49x2 49 x 2 as (7x)2 ( 7 x ) 2 . Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) a 2 - b 2 = ( a + b ) ( a - b ) where a=9 and b=7x b = 7 x .
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