Question

Which equation is a quadratic equation?

y = 2x(5 − x) + 7x

y = 8x + 2

y + x2 = (x − 2)(x + 8)

y − 7x = (x2 + 1)(x − 3)

Answer 1

which one has only x^2 terms and below

Answer 2

C?

Answer 3

actually this question is a bit tricky since the third one looks quadratic, but actually is not

Answer 4

\[y + x^2 = (x − 2)(x + 8) \]
\[y+x^2=x^2+6x-16\] and the \(x^2\) term cancels from both sides to give
\[y=6x-16\] so it is not quadratic

Answer 5

:/

Answer 6

multiply out for the first one, combine like terms, and you will see that it is a quadratic

Answer 7

oh yea, duh! I should've seen that. Thank you

Answer 8

yw