How do you solve #x(2x + 7) = 4#?
x = -4
x = -0.5
x(2x + 7) = 4
First multiply out the brackets and bring the 4 to the left hand side
2x^2 + 7x - 4 = 0
Then plug the above equation into the quadratic formula where
a = 2 b=7 and c= -4
This will give you two answers using the +/- before the square root for 2 different answers.