Question

Which of the following is not a quadratic equation: (x-2)^2 +1= 2x-3 x(x+1) +8 = (x+2)(x-2) x(2x+3) = x^2 +1 (x+2)^3 = x^3 - 4

Answer 1

Answer:

x(x-1)+8=(x+2)(x-2) is not a quadratic equation

x²-x+8=x²-4

x²-x²-x+8+4=0

-x+12=0

so the highest power of x is not = 2