Solve the quadratic:
n2+n-72 = 0
Set up the a, b, and c values:
a = 1, b = 1, c = -72
Quadratic Formula
| n = | -b ± √b2 - 4ac |
| 2a |
Calculate -b
-b = -(1)
-b = -1
Calculate the discriminant Δ
Δ = b2 - 4ac:
Δ = 12 - 4 x 1 x -72
Δ = 1 - -288
Δ = 289 <--- Discriminant
Since Δ > 0, we expect two real roots.
Take the square root of Δ
√Δ = √(289)
√Δ = 17
-b + Δ:
Numerator 1 = -b + √Δ
Numerator 1 = -1 + 17
Numerator 1 = 16
-b - Δ:
Numerator 2 = -b - √Δ
Numerator 2 = -1 - 17
Numerator 2 = -18
Calculate 2a
Denominator = 2 * a
Denominator = 2 * 1
Denominator = 2
Find Solutions
| Solution 1 = | Numerator 1 |
| Denominator |
| Solution 1 = | 16 |
| 2 |
Solution 1 = 8
Solution 2
| Solution 2 = | Numerator 2 |
| Denominator |
| Solution 2 = | -18 |
| 2 |
Solution 2 = -9
Solution Set
(Solution 1, Solution 2) = (8, -9)
Prove our first answer
(8)2 + 1(8) - 72 ? 0
(64) + 872 ? 0
64 + 872 ? 0
0 = 0
Prove our second answer
(-9)2 + 1(-9) - 72 ? 0
(81) - 972 ? 0
81 - 972 ? 0
0 = 0
Final Answer
(Solution 1, Solution 2) = (8, -9)
You have 1 free calculations remaining
What is the Answer?
(Solution 1, Solution 2) = (8, -9)
How does the Quadratic Equations and Inequalities Calculator work?
Free Quadratic Equations and Inequalities Calculator - Solves for quadratic equations in the form ax2 + bx + c = 0. Also generates practice problems as well as hints for each problem.
* Solve using the quadratic formula and the discriminant Δ
* Complete the Square for the Quadratic
* Factor the Quadratic
* Y-Intercept
* Vertex (h,k) of the parabola formed by the quadratic where h is the Axis of Symmetry as well as the vertex form of the equation a(h - h)2 + k
* Concavity of the parabola formed by the quadratic
* Using the Rational Root Theorem (Rational Zero Theorem), the calculator will determine potential roots which can then be tested against the synthetic calculator.
This calculator has 4 inputs.
What 5 formulas are used for the Quadratic Equations and Inequalities Calculator?
y = ax2 + bx + c(-b ± √b2 - 4ac)/2a
h (Axis of Symmetry) = -b/2a
The vertex of a parabola is (h,k) where y = a(x - h)2 + k
For more math formulas, check out our Formula Dossier
What 9 concepts are covered in the Quadratic Equations and Inequalities Calculator?
complete the squarea technique for converting a quadratic polynomial of the form ax2 + bx + c to a(x - h)2 + kequationa statement declaring two mathematical expressions are equalfactora divisor of an integer n, also called a factor of n, is an integer m that may be multiplied by some integer to produce n.interceptparabolaa plane curve which is approximately U-shapedquadraticPolynomials with a maximum term degree as the second degreequadratic equations and inequalitiesrational rootvertexHighest point or where 2 curves meetExample calculations for the Quadratic Equations and Inequalities Calculator
Quadratic Equations and Inequalities Calculator Video
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