Which equation is a quadratic equation?

5x − 2 = y

y + 15x2 = (3x − 2)(5x + 7)

y = 3x(5 − x) + 7

y + 2 = (3x2 + 10)(x − 1)

Question

Which equation is a quadratic equation?

 5x − 2 = y

 y + 15x2 = (3x − 2)(5x + 7)

 y = 3x(5 − x) + 7

 y + 2 = (3x2 + 10)(x − 1)

anonymous · Answer

quadratic equation is any equation having x^2 and is equal to zero

anonymous · Answer

HINT: Quadratic equations have X^2 in it

anonymous · Answer

So is it y + 15x2 = (3x − 2)(5x + 7)

anonymous · Answer

there are more terms with the highest power of 2 to x (x^2)
please multiply all out and see which one equals zero

anonymous · Answer

I know there is more then one.

anonymous · Answer

I am asking you if y + 15x2 = (3x − 2)(5x + 7) is the right one.

anonymous · Answer

How did u get to this answer

anonymous · Answer

So its not the answer?

amistre64 · Answer

it looks right, but it has a flaw in it .....

amistre64 · Answer

when you multiply that out on the right side; you get a 3x*5x = 15x^2 right?

amistre64 · Answer

y + b = b + c    ; when we simplify
   - b   -b
-------------
y       =        c    ; the term that is alike on each side goes away

anonymous · Answer

okay thanks

amistre64 · Answer

yw, so what "looks" like it could be a quadratic in that case is just a disguised linear :/  sneaky wasnt they :)