Solve each equation using the quadratic formula. x2 - x - 1 = 0
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
1. Equations & Inequalities
The Square Root Property
Multiple Choice
Solve the given quadratic equation using the square root property. 2x2−16=0
A
x=0,x=−2
B
x=42,x=−42
C
x=4,x=−4
D
x=22,x=−22
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Verified step by step guidance1
Start by isolating the quadratic term. The given equation is 2x^2 - 16 = 0. Add 16 to both sides to get 2x^2 = 16.
Divide both sides of the equation by 2 to solve for x^2. This gives x^2 = 8.
Apply the square root property to solve for x. The square root property states that if x^2 = a, then x = ±√a. Therefore, x = ±√8.
Simplify the square root of 8. Note that √8 can be expressed as √(4 * 2), which simplifies to 2√2.
Conclude that the solutions to the equation are x = 2√2 and x = -2√2.
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