Answers

2015-05-12T14:47:05+05:30
Use the given hint-

5\sqrt{2}\times\sqrt{2}=10
So pick two numbers such that they add up to 7 and multiply to 10 :
2+5=7 and 2*5=10

Split the middle term as 2x+5x and factor :
\sqrt{2}x^2\underbrace{+7x}+5\sqrt{2}

=\sqrt{2}x^2\underbrace{+2x+5x}+5\sqrt{2}

=\sqrt{2}x(x+\sqrt{2})+5(x+\sqrt{2})

=(x+\sqrt{2})(\sqrt{2}x+5)

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