a two digit no. is such that the product of its digit is 14 . if 45 is needed to the digit intetchange their place find the no.
sherryshauryasharma:
can u tell me if 45 is added or multiplied
added
typing mistake
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Hi Mate!!!
Let the dights be x and y
xy = 14 ( given )..... equation 1
10x + y = 45 + 10y + x
9x -9y = 45
x - y = 5 ..... equation 2
x - 14 / x = 5
x² -5x -14 = 0
x² -7x +2x -14 = 0
x ( x -7 ) + 2 ( x - 7 ) = 0
x = -2 and x = 7
For x = -2 y = -7
For x = 7 y = 2
So, the no. is 72
Let the dights be x and y
xy = 14 ( given )..... equation 1
10x + y = 45 + 10y + x
9x -9y = 45
x - y = 5 ..... equation 2
x - 14 / x = 5
x² -5x -14 = 0
x² -7x +2x -14 = 0
x ( x -7 ) + 2 ( x - 7 ) = 0
x = -2 and x = 7
For x = -2 y = -7
For x = 7 y = 2
So, the no. is 72
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