Multiple choice

Which one the following is not a quadratic equation?

  1. (x+2)2 = 2(x+3)

  2. x2+ 3x = (-1) (1-3x)2

  3. (x+2) (x-1) = x2 - 2x-3

  4. x2 - x2 + 2x+1 = (1-3x)
Reveal answer Fill a bubble to check yourself
C Correct answer
AI explanation

Expand and simplify option C by multiplying the left side to get x2 + x - 2 = x2 - 2x - 3. Canceling x2 from both sides leaves x - 2 = -2x - 3. This simplifies to 3x = -1, which is a linear equation, not a quadratic equation, because the highest power of x is one.

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