Advanced MathEasy–MediumPositive input where a square equals a double
Advanced Math practice question
The functions f and g are defined by f(x) = x² and g(x) = 2x. For what positive value of x is f(x) equal to g(x)?
Answer: 2
x² = 2x gives x = 0 or x = 2; the positive one is 2.
Common wrong answers
- If you answered 0
- 0 is not positive.
- If you answered 1
- 1 gives 1 and 2.
- If you answered 4
- 4 gives 16 and 8.
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 ?
Not affiliated with the College Board. SAT is a trademark of the College Board.