Advanced Math practice question

Answer: 15

(x − 3)² = x² − 6x + 9, so c − b = 9 − (−6) = 15.

Common wrong answers

If you answered 3

3 uses c = 9 and b = 6 with the wrong sign.

If you answered 9

9 is c alone.

If you answered -15

−15 subtracts the wrong way.

More Advanced Math questions

• Easy–Medium
  If f(x) = 2x² − 3, what is f(4)?
• Easy–Medium
  Which expression is equivalent to (2x³)(3x⁴)?
• Easy–Medium
  What are the solutions to x² − 16 = 0?
• Easy–Medium
  Which expression is equivalent to (x + 5)²?
• Easy–Medium
  For x ≠ 0, which expression is equivalent to (x² + 3x) / x?
• Easy–Medium
  What are the solutions to the equation 2(x − 3)² − 32 = 0 ?