16Hit1600
Advanced MathMediumQuadratic equations

Advanced Math practice question

What are the solutions to x² − 5x + 6 = 0?

  1. A. x = 1 and x = 6
  2. B. x = 2 and x = 3Correct
  3. C. x = −2 and x = −3
  4. D. x = −1 and x = 6

Answer: B. x = 2 and x = 3

Factor: (x − 2)(x − 3) = 0, so x = 2 or x = 3. The product of the roots is 6 and the sum is 5 — that instantly rules out the negative options.

Why the other answers are wrong

A. x = 1 and x = 6
1 and 6 multiply to 6 but add to 7, not 5 — you need two numbers with product 6 and sum 5, which are 2 and 3.
C. x = −2 and x = −3
You got the right pair of numbers but the wrong signs: (x − 2)(x − 3) gives x = 2 and x = 3, and negative roots would make the middle term +5x.
D. x = −1 and x = 6
These don't satisfy the equation — you need roots with product 6 and sum 5, and −1 and 6 give product −6 and sum 5.

More Advanced Math questions

Not affiliated with the College Board. SAT is a trademark of the College Board.