(a)(5x + 7y)? – InterviewSolution

1.

(a)(5x + 7y)?

Answer»

if the angle between unit and vector a"and bak

25 xsquare + 49 ysquare

74xy2 is the correct answer

25xsqure+49ysqure+70xy

= 5x square+7y square-70xy is the right answer of this question

(a+b)²=a²+2ab+b²: (5x7y)²=(5x)²+2(5x)(7y)+(7y)²=25x²+49y²=25x²+70xy+49y²

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