Advanced Math practice question

Answer: 5

Subtract 1: x² = 25. The positive square root is 5.

Common wrong answers

If you answered 13

13 is 26/2, halving instead of subtracting 1 and taking the root.

If you answered 25

25 is x², one step short; take the square root.

If you answered 5.1

5.1 is about √26, taking the root before subtracting 1.

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 ?