16Hit 1600
Advanced MathEasy–MediumCoefficient of an exponential from one value

Advanced Math practice question

The function g is defined by g(x) = c · 3ˣ for a constant c, and g(2) = 45. What is the value of c?

Answer: 5

g(2) = c · 9 = 45, so c = 5.

Common wrong answers

If you answered 9
9 is 3²; c is 45 divided by it.
If you answered 15
Divide 45 by 3² = 9, not by 3.
If you answered 405
c multiplies 9 to give 45 — divide rather than multiply.

More Advanced Math questions

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