Question
Use a graphing utility to solve the equation In \( x=x^{2}-3 \) The solution set is \( \} \) (Use a comma to separate answers as needed Round to two decimal places as needed)
Ask by Reese Huang. in the United States
Jan 22,2025
Real Tutor Solution
Tutor-Verified Answer
Answer
The solutions are \(x \approx -1.30\) and \(x \approx 2.30\).
Solution
Solve the equation \( x=x^{2}-3 \).
Solve the quadratic equation by following steps:
- step0: Solve using the quadratic formula:
\(x=x^{2}-3\)
- step1: Swap the sides:
\(x^{2}-3=x\)
- step2: Move the expression to the left side:
\(x^{2}-3-x=0\)
- step3: Rewrite in standard form:
\(x^{2}-x-3=0\)
- step4: Solve using the quadratic formula:
\(x=\frac{1\pm \sqrt{\left(-1\right)^{2}-4\left(-3\right)}}{2}\)
- step5: Simplify the expression:
\(x=\frac{1\pm \sqrt{13}}{2}\)
- step6: Separate into possible cases:
\(\begin{align}&x=\frac{1+\sqrt{13}}{2}\\&x=\frac{1-\sqrt{13}}{2}\end{align}\)
- step7: Rewrite:
\(x_{1}=\frac{1-\sqrt{13}}{2},x_{2}=\frac{1+\sqrt{13}}{2}\)
The solutions to the equation \(x = x^2 - 3\) are \(x \approx -1.302776\) and \(x \approx 2.302776\).
Reviewed and approved by the UpStudy tutoring team
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Mind Expander
To solve the equation \( \ln x = x^2 - 3 \) using a graphing utility, first, plot the two functions \( y = \ln x \) and \( y = x^2 - 3 \) on the same graph. The points where these two graphs intersect represent the solutions to the equation. Upon graphing, you might find the intersections approximately around \( x \approx 3.31 \) and \( x \approx 0.31 \). Thus, rounding to two decimal places, the solution set is \( \{0.31, 3.31\} \).