3x - 10 + x = 90
4x = 100
x = 25 degrees
Hi!
For this equation, you can solve it by using the quadratic formula:
x=-b<span>±sqrt/b^2-4ab
-----------------------
2a</span>
Step-by-step explanation:
We need to say that
is equivalent to what.
We know that, (3)² = 9
So,

We can write 
And 
So,

So,
is equivalent to
.
Hence, this is the required solution.
A triangle, cut it straight down the middle and you get a triangle