Solve the given quadratic equation by factoring.
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 using the quadratic formula.
3x2+4x+1=0
A
x=3,x=−1
B
x=−31,x=−1
C
x=−3,x=−1
D
x=31,x=−1
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Verified step by step guidance1
Identify the coefficients in the quadratic equation 3x^2 + 4x + 1 = 0. Here, a = 3, b = 4, and c = 1.
Recall the quadratic formula: x = \(\frac{-b \pm \sqrt{b^2 - 4ac}\)}{2a}. This formula is used to find the roots of a quadratic equation ax^2 + bx + c = 0.
Substitute the identified coefficients into the quadratic formula: x = \(\frac{-4 \pm \sqrt{4^2 - 4 \cdot 3 \cdot 1}\)}{2 \(\cdot\) 3}.
Calculate the discriminant, which is the expression under the square root: b^2 - 4ac = 4^2 - 4 \(\cdot\) 3 \(\cdot\) 1. Simplify this to find the value of the discriminant.
Use the value of the discriminant to determine the roots by completing the calculation in the quadratic formula: x = \(\frac{-4 \pm \sqrt{discriminant}\)}{6}. Simplify to find the two possible values for x.
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