Use a graphing calculator to estimate the solution set of the equation. Round to the nearest hundredth.
-$7 e ^ { 2.4 x } = 45$
A) {4.47}
B) {0.78}
C) {5.58}
D) {1.86}

Question

Quizplus · Accepted Answer

To solve $7e^{2.4x} = 45$, you can use a graphing calculator to graph the function $y = 7e^{2.4x}$ and the line $y = 45$. The x-coordinate of the point where these two graphs intersect is the solution to the equation. When you graph these, you'll find that they intersect near $x = 0.78$, hence option B is correct.

Use a Graphing Calculator to Estimate the Solution Set of the Equation