Which of the following pair of numbers is the solution of the equation 3x 2 3 ndash x 10 ........

Quantitative Aptitude (CDS) Quadratic Equations

Which of the following pair of numbers is the solution of the equation 3^x+2+ 3^–x = 10 ?

0,2

0 , -2

1, -1

1,2

3^x+2 + 3^-x= 10

Only powers of 3 that add upto 10 is 3² + 3⁰ = 10

X+2 = 0 X= -2

solution is consistent Or x+2 = 2 X= 0 solution is consistent

Thus x = 0, -2 are the solutions Alternatively, we can put values from the options and check.

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