[9.01] Which equation is a quadratic equation?

Question

goformit100 · Answer

quadratic equation   
 
(plural quad·rat·ic e·qua·tions) 
noun 
 equation containing squared terms: an equation containing one or more terms raised to the power of two but no higher

callisto · Answer

@Karakuhnn I think the question is incomplete...

anonymous · Answer

a. 5x − 2 = y
b. y + 15x^2 = (3x − 2)(5x + 7)
C. y = 3x(5 − x) + 7
d.y + 2 = (3x^2 + 10)(x − 1)

goformit100 · Answer

@JoannaiA

anonymous · Answer

A Quadratic Equation is one that has a degree of 2. Which of the choices has a squared term like $x^{2}$?

anonymous · Answer

B and D do

anonymous · Answer

Well, D indeed does have a squared term, but when you fully multiply out (3x^2 + 10)(x − 1), you get a cubic because (3x^2 + 10)(x − 1) = 3x^3 - 3x^2 + 10x - 10. See how it turns to a degree of 3?
THerefore, it's B since it will stay with a degree of 2.

anonymous · Answer

oh ok i see..thank you!