Which one of the following is not a quadratic equation?
A. (x + 2)2 = 2(x + 3)
B. x2 + 3x = (–1) (1 – 3x)2
C. (x + 2) (x – 1) = x2 – 2x – 3
D. x3 – x2 + 2x + 1 = (x + 1)3
Answer:C
Which one of the following is not a quadratic equation?
A. (x + 2)2 = 2(x + 3) B. x2 + 3x = (–1) (1 – 3x)2 C. (x + 2) (x – 1) = x2 – 2x – 3 D. x3 – x2 + 2x + 1 = (x + 1)3
Explanation: We know that the degree of a quadratic equation is 2.