Select all of the following that are quadratic equations.

a. 7x^2+ 14x= 0
b. x^3- 3x^2+ 1 = 0
c. 5x- 7 = 0
d. x^2+ 3x-5 = 0
e. x- 5 = 9x+ 7
f. x^2-x= 3x+ 7

i got b and d because of the quadratic equation formula. are my answers right?

Question

Select all of the following that are quadratic equations.

a. 7x^2+ 14x= 0
b. x^3- 3x^2+ 1 = 0
c. 5x- 7 = 0
d. x^2+ 3x-5 = 0
e. x- 5 = 9x+ 7
f. x^2-x= 3x+ 7

i got b and d because of the quadratic equation formula. are my answers right?>

anonymous · Answer

or am i missing some?

hartnn · Answer

quadratic equations have power of 2...so search for ^2 terms...and not higher..

hartnn · Answer

b has ^3 terms also,so its not quadratic...d u chose correct but there are more equation with power of 2

anonymous · Answer

how about a and f?

hartnn · Answer

u got it,so total 3 equations...