26. Use suitable identity to get each of the following products.i) (2y – InterviewSolution

1.

26. Use suitable identity to get each of the following products.i) (2y+ 5) (2y +5)i) (6x + 7) (6x -7)

Answer»

1)(2y+5)(2y+5)=(2y+5)^2(a+b)^2=a^2+b^2+2abhence4y^2+25+20y2)(6x+7)(6x-7)(a+b)(a-b)=a^2-b^2hence(6x)^2-7^2=36x^2-49

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