Question

Which of the following equations is quadratic?

x(x^2 + 1) = 0
5(4x + 2) = 3
(x + 3)(x + 4) = 5

Answer 1

Expand each of them and whichever has a degree of 2 (quadratic) will be your answer.

Answer 2

What do you mean?

Answer 3

@AkashdeepDeb

Answer 4

@SolomonZelman

Answer 5

degree two meaning ax^2...etc

Answer 6

\[x^2 \implies degree ~ 2\] you can think of it as degree two since it has 2 on the x I guess.

Answer 7

What do you mean "degree 2?"

Answer 8

I just explained it

Answer 9

So expand your problem and if it has x^2 that's the one..

Answer 10

So, A????

Answer 11

Just expand it.

Answer 12

Each of the problems, meaning multiply through if that helps.

Answer 13

What is \[x \times x^2\]

Answer 14

x^3, I think.

Answer 15

Yeah, so x(x^2+1)= 0 means x^3+x=0

Answer 16

Do that with the others.

Answer 17

And notice it's x^3 so it's not of degree 2.

Answer 18

20x + 10 = 3 is B

Answer 19

Good

Answer 20

Last one?

Answer 21

You can foil that out, meaning