ANSWER
When 
is written in the form 
, it looks like 
EXPLANATION
To write in the form , we have to complete the squares.
We add and subtract half the coefficient of 
square.
The first three terms of the function is now a perfect square.
We now simplify rto obtain,
Answer: x=18
im assuming that this is a right angle
so if it is then that means the total of the angle should be 90 degrees. so 2x+3x should be equal to 90. Just combine like terms to get that 5x=90 and then isolate the variable (divide by 5 on both sides) so x ends up equaling 18.
so x=18
