Question

Which equation is a quadratic equation?

a. y + 7 = −3x(4 − x) + 9x
b. y = −2x + 5
c. y + 2x3 = (2x − 2)(x + 5)
d. y − 9x = (x2 + 1)(5x − 1) + 3

Answer 1

\[ax^2+bx+c\]
is a quadratic equation
degree should be 2

Answer 2

not that clear is it?

Answer 3

Im confused

Answer 4

of course they are trying to confuse you

Answer 5

ok...

Answer 6

\[y=-2x+5\] is not a quadratic, because the degree is 1 \(x^1\)

Answer 7

\[ y + 2x^3 = (2x − 2)(x + 5) \]
\[y=-2x^3+(2x-2)(x+5)\] is not a quadratice the degree is \(3\) :\(x^3\)

Answer 8

ok

Answer 9

\[ y + 7 = −3x(4 − x) + 9x \]
\[y=3x^2-12x+9x-7\]
\[y=3x^2-3x-7\] IS a quadratic, the degree is \(2\) : \(x^2\)

Answer 10

so the answer is a?

Answer 11

yes

Answer 12

thanks!