Factorise 50a^2 + 98 b^2 + 140ab
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=5root2a+7root2b+2×5root2×7root2ab
=(5root2a+7root2b)whole square
=(5root2a+7root2b)whole square
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This expression is written in the form of (5√2a)^2+ (7√2b)^2+2*5√2*7√2*ab
(a+b)^2 =a^2 + b^2+ 2ab
(a+b)^2 =a^2 + b^2+ 2ab
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