Question

If
x-1
3
then
2+1
+ 3
90
is equal to
-​

Answer 1

Answer:

I'm not sure with the question you typed but...

I'm solving the question in the picture.

$3^{x-1} + 3^{x+1} = 90$

As bases are equal

On comparing powers

$x-1 + x+1 = 90$

$2x=90$

$x = \frac{90}{2}=45$

Hope it helps you