Question

1. Which of the following is a quadratic equation? A. X- 6x + 10 = 0 C. 2x - 3x-9 = 0 B. (x-1) = 0 D. (x + 1) (x - 2) = 0​

Answer 1

Answer:

option d) (x+1)(x+2)=0 is the quadratic equation because:

(x+1)(x+2)=0

•x²+2x+x+2

•x²+3x+2

Here the highest power of the variable is 2.So it is a quadratic equation.