The 3 inside angles of a triangle need to equal 180 degrees.
Add the 3 angles together to equal 180:
X + x+2 + 6x +10 = 180
Simplify:
8x + 12 = 180
Subtract 12 from each side:
8x = 168
Divide each side by 8:
x = 168 / 8
X = 21
a) x = 21
b) C = 6x+10
replace x with 21:
6(21) + 10 =
126 +10 = 136
Answer:
B (-1,0), (3,0)
Step-by-step explanation:
Quadratic Formula
X^2+19x+90
You distribute each number to each other then at the end add the common terms together. Also you add the x’s exponents when distributing or multiplying.