Answer:

Step-by-step explanation:
We must develop three equations in three unknowns.
I will use these three:



(16x^2+4x-4x-1)-3=15x^2
16x^2-1-3=15x^2
16x^2-4=15x^2
X^2=4
X=+or-2
Answer:
The first one would be 30.
Step-by-step explanation:
First you multiply the 8 x 4, because the 4 and P are multiplying you just substitute the variable, and then substract 2.
Since 2=3
And 3 and 7 are on a straight line so they add up to 180
You can say : x+ 2x= 180
3x=180
x=180/3
x= 60
Angle 2 is 60