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)

Answer 1

what do you think which is a quadratic equation?

Answer 2

http://www.purplemath.com/modules/quadform.htm

Answer 3

@simplybeyoutiful

Answer 4

im not sure

Answer 5

enjoy the link :-) it is really helpful

Answer 6

Ok what is your guess @simplybeyoutiful

Answer 7

for simplicity if the highest power in an equation is 2, then it is a quadratic

Answer 8

"highest power--> degree of the polynomial ( variable ) "

Answer 9

\[x^2\]
is a quadratic

Answer 10

yes, thanks math

Answer 11

but not necessary as in the above options 15x^2 is there but -15x^2 is also there

Answer 12

Hence we have to SIMPLIFY it fully

Answer 13

it could be \[-x^2\]

Answer 14

i dont think its the second

Answer 15

simply, just go to the link that I posted :-)

Answer 16

1st one nope

Answer 17

i think its the 3rd

Answer 18

2nd one also not :)

Answer 19

yes!!!

Answer 20

no..

Answer 21

Hence the answer is ... 3rd one @simplybeyoutiful

Answer 22

okay thats what i was thinking