X (x+7) = 4 (6+4) solve for x

X (x+7) = 4 (6+4)

x^2 + 7x = 24 + 16

x^2 + 7x - 40 = 0

a=1 b=7 c=-40

Using the quadratic formula:

x = [-7 + - sq root (49 - 4*1*-40) ] / 2*1

x = [-7 + - sq root (209) ] / 2

x1 = [-7 + 14.4568322948] / 2

x1 = 3.7284161474

x2 = [-7 - 14.4568322948] / 2

x2 = - 10.7284161474