Friday, December 27, 2013

Solve the inequality 16^(x-1)>2^(2x+2)

We'll write both bases as power of
2:


2^4(x-1)>2^(2x+2)


Since
the bases are bigger than unit value, the function is increasing and we'll
get:


4(x-1)> 2x+2


We'll
divide by 2:


2(x- 1) > x +
1


We'll remove the
brackets:


2x - 2 > x +
1


We'll subtract x both
sides:


2x - x - 2 > 1


x
- 2 > 1


We'll add 2 both
sides:


x > 2 + 1


x
> 3


The interval of values of x, for
the inequality holds, is (3 , +infinite).

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