Question

Calculate the value of the exterior angle (8x+15) the two equations inside the triangle are 4x+5 and 3x+20

Answer 1

well the exterior angle of a triangle is equal to the sum of the opposite interior angles

so you can set up the equation

4x + 5 + 3x + 20 = 8x + 15

which becomes

7x + 25 = 8x + 15

you can now solve for x.

then to find the exterior angle, substitute it back into

8x + 15 to find the measure.

hope it helps