Question

Which of the following equations are quadratic?
(i) 13 = 5y^₂ $-$ y^₃

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: 13 = – 5y² – y³
On transposing all the terms of the right-hand side to the left-hand side, we get:
5y² + y³ + 13 = 0
This is not a quadratic equation as the highest index of the variable y is 3.