Question

x² + 4x = 11

Answer 1

An equation is quadratic in variable x if it is of the form ax²+bx+c = 0, where a,b and c are real numbers and a$\ne$0.
Given: x² + 4x = 11
On transposing 11 from the right-hand side to the left-hand side, we get:
x² + 4x – 11 = 0
On comparing this equation with the general form of the quadratic equation, we find that it is a quadratic equation in variable x.
Also, a =1, b = 4 and c = – 11, which are real numbers and a $\ne$ 0.