Question

Which equation is a quadratic equation?

A. 5x − 2 = y
B. y + 15x2 = (3x − 2)(5x + 7)
C. y = 3x(5 − x) + 7
D. y + 2 = (3x2 + 10)(x − 1)

Answer 1

B and C are quadratic equations
A is not
D is quartic (i think thats the right name, no idea)

Answer 2

only C is quadratic....

Answer 3

B is a quadratic equation because the maximum power of x is 2 and the minimum is 0

Answer 4

C is also a quadratic equation for the same reason

Answer 5

no in B \[15x ^{2}\] lies on both the sides of the equation....it gets cancelled...