Maths-
General
Easy

Question

5 If 3 to the power of x plus 1 end exponent equals 9 to the power of x minus 2 end exponent, also find the value of 2 to the power of x plus 2 end exponent.

hintHint:

In Mathematics, lets say, "a" represents a number and " n " is the number of times that number is to be multiplied with itself, in order to get a desired result. Then, such result can be written as an, where a is called the base and n is its power/ exponent.
a to the power of n equals a cross times a cross times horizontal ellipsis cross times an times.

The correct answer is: 128


    Step-by-step solution:-
    3 to the power of x plus 1 end exponent equals 9 to the power of x minus 2 end exponent
    therefore 3 to the power of left parenthesis x plus 1 right parenthesis end exponent equals 3 to the power of 2 left parenthesis x minus 2 right parenthesis end exponent
    therefore 3 to the power of left parenthesis x plus 1 right parenthesis end exponent equals 3 to the power of left parenthesis 2 x minus 4 right parenthesis end exponent               open square brackets open parentheses b to the power of n close parentheses to the power of m equals b to the power of n m end exponent close square brackets
    therefore x plus 1 equals 2 x minus 4                       (Exponents of the same base in an equation are equal)
    table attributes columnalign right left right left right left right left right left right left columnspacing 0em 2em 0em 2em 0em 2em 0em 2em 0em 2em 0em end attributes row cell therefore 1 plus 4 equals 2 x minus x end cell row cell therefore space of 1em 5 equals straight x end cell row blank end table
    x equals 5             text  (Equation i)  end text
    2 to the power of left parenthesis x plus 2 right parenthesis end exponent equals 2 to the power of left parenthesis 5 plus 2 right parenthesis end exponent         (From Equation i)
    therefore 2 to the power of left parenthesis x plus 2 right parenthesis end exponent equals 2 to the power of 7
    therefore 2 to the power of left parenthesis x plus 2 right parenthesis end exponent equals 128

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