Solve the given quadratic equation using the square root property.
Table of contents
- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
0. Review of College Algebra
Solving Quadratic Equations
Multiple Choice
Solve the given quadratic equation by completing the square.
x2+3x−5=0
A
x=−23,x=25
B
x=−23,x=29
C
x=2−3+29,x=2−3−29
D
x=23+29,x=23−29
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Verified step by step guidance1
Start with the quadratic equation: x^2 + 3x - 5 = 0.
Move the constant term to the other side of the equation: x^2 + 3x = 5.
To complete the square, take half of the coefficient of x, which is 3, divide it by 2 to get 3/2, and then square it to get (3/2)^2 = 9/4.
Add and subtract 9/4 inside the equation to maintain equality: x^2 + 3x + 9/4 - 9/4 = 5.
Rewrite the left side as a perfect square trinomial: (x + 3/2)^2 = 5 + 9/4, then solve for x by taking the square root of both sides and isolating x.
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