Group x terms
(2x^2+8x)-12=0
undistribute 2
2(x^2+4x)-12=0
take 1/2 of 4 and square it, add negative and positive of it insde (2^2=4)
2(x^2+4x+4-4)-12=0
factor perfect square
2((x+2)^2-4)-12=0
distribute
2(x+2)^2-8-12=0
2(x+2)^2-20=0
add 20 to both sides
2(x+2)^2=20
divide both sides by 2
(x+2)^2=10
sqrt both sides, remember to take positive and negative root
x+2=+/-√10
minus 2 both sides
x=-2+√10 and -2-√10
The answer is E because 3 x 0 - 4 x -2 = 8
AB=24 AC=24. The triangle is SSS Which means all sides are congruent so just setting AB = AC then finding x. Then plugging it in u get your answer
358 will be rounded to 360 and 292 will be rounded to 290 so 360-290 =70