Question

Which of the following equations is quadratic?
x(x2 + 1) = 0
5(4x + 2) = 3
(x + 3)(x + 4) = 5

Answer 1

3rd

Answer 2

\[\left( x+3 \right)\left( x+4 \right) = x ^{2} + 7x +12 \]
Since highest power of x is 2 So this is Quadratic Equation

Answer 3

because if you multiply you get something like this
x^2+7x+12

Answer 4

,,Corey" do you know when an equation is quadratic ?