Question

[9.01] Which equation is a quadratic equation?

3x − y = 8x + 2

y = 7x(5 − 2x) + 9

7x2 + y = (3 + x)(7x − 1)

y − 3 = (x2 − 3)(8x + 3)

Answer 1

The third. When you expand it, you see it has a degree of 2

Answer 2

degree?

Answer 3

Ah yes haha sorry, when you have a polinomial, the degree is the number of the biggest exponent. So since for example \(x+1=x^1+1\), the degree of \(x+1\) is 1. Something like \(x^2+2x-4\) would have a degree of two. Or for example, something like \(x^9-x^7+x^2-16\) has a degree of nine