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(x + 3y)^2
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31 Oct 2018, 17:58
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Question Stats:
95% (00:23) correct
\((x + 3y)^2\) =
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
Re: (x + 3y)^2
[#permalink]
31 Oct 2018, 19:39
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pushpitkc wrote:
\((x + 3y)^2\) =
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
Apply \((a+b)^2=a^2+2ab+b^2\)
Now, \((x + 3y)^2=x^2 + 2*x*3y + (3y)^2=x^2 + 6xy + 9y^2\)
Ans. (E)
(x + 3y)^2
[#permalink]
01 Nov 2018, 04:24
pushpitkc wrote:
\((x + 3y)^2\) =
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
A. \(x^2 + 3y^2\)
B. \(x^2 + 9y^2\)
C. \(x^2 + 3xy + 3y^2\)
D. \(x^2 + 3xy + 9y^2\)
E. \(x^2 + 6xy + 9y^2\)
simple application of formula
\((a+b)^2\)=\(a^2\)+\(2ab\)+\(b^2\)
\((x + 3y)^2\) = \(x^2 + 6xy + 9y^2\)
Option E