Advanced Math practice question

Answer: 3

n² = 2n + 3 gives n² − 2n − 3 = (n − 3)(n + 1) = 0, so n = 3.

Common wrong answers

If you answered 1

1 gives 1 = 5.

If you answered 9

9 is the square, not the number.

If you answered -1

−1 also satisfies the equation but is not positive.

More Advanced Math questions

• Easy
  If f(x) = 3x − 7, what is the value of f(5)?
• Easy
  What are the solutions to x² − 9 = 0?
• Easy
  Which of the following expressions is equivalent to x² + 7x + 12 ?
• Easy
  The function g is defined by g(x) = x³ + 2x. What is the value of g(−2) ?
• Easy
  For x > 0, which of the following is equivalent to ∛(x⁵) ?
• Easy
  The function h is defined by h(x) = (x − 6)(x + 2). What is one value of x for which h(x) = 0 ?