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Quantitative Aptitude

Functions

log x+log x+3...

Question

log x +log (x+3) = 1 then value of x =

A

2, 5

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B

-2,-5

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C

2,-5

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D

-2,-5

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Solution

The correct option is C 2,-5
log x +log (x+3) = 1
log (x(x+3)) = log10
(x(x+3)) = 10
$x^{2}$ +3x -10 = 0
(x-2)(x+5) = 0
x=2, x=-5

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