* Factorize 2x+(x + y) – {y(x + y)2 =
(A) (x + y)(2x + y)(2x - y)
(C) (x + y)(V2 x - xy - y2)(2x + xy + y2)
2)
(C)
* 2
(B) (x + y) (2x + xy + y))(2x – xy - y3)
(D) none of these
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Sum of the digits of a two-digit number is 12. The given number exceeds the number obtained by interchanging the digits by 36. Find the given
number.
The tens digit of the required number be x
and the units digit be y
x + y = 12 ......... eq. (1)
Required number = (10x + y)
Number obtained on reversing the digits = (10y + x)
(10y + x) - (10x + y) = 18
9y - 9x = 18
x - y = 12 ......... eq. (2)<br>
On adding eq. (1) and eq. (2)
x + y + y - x = 12 +2
2y = 14
y = 2
x = 5
Hence, the required number is 57
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Answer:
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