Solve for x:
2/25 x (x+8) = 4
Multiply both sides by 25/2:
x (x+8) = 50
Expand out terms of the left hand side:
x^2+8 x = 50
Add 16 to both sides:
x^2+8 x+16 = 66
Write the left hand side as a square:
(x+4)^2 = 66
Take the square root of both sides:
x+4 = sqrt(66) or x+4 = -sqrt(66)
Subtract 4 from both sides:
x = sqrt(66)-4 or x+4 = -sqrt(66)
Subtract 4 from both sides:
Answer: | x = sqrt(66)-4 or x = -4-sqrt(66)
