X is 30 because
x-4x=-90
-3x=-90
x=30
-13x+14=13x-12
Hope this helps!
Two consecutive numbers who’s square differs by 25 are 12 and 13. Those two numbers are consecutive and the numbers 144 and 169 differ by 25. The answer is 12 and 13.
5(x²+x-2x-2)
5(x²-x-2)
5x²-5x-10
you can also simplify to x²-x-2.
You do 108 - 4x +8
then solve for x