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)

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)

anonymous · Answer

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

savvy · Answer

only C is quadratic....

anonymous · Answer

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

anonymous · Answer

C is also a quadratic equation for the same reason

savvy · Answer

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