Mister Exam
Other calculators
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How to use it?
- Equation:
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Equation 3*x^2-9=0
- Equation x^4-35*x^2-36=0
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Equation x^3=64
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Equation 3*sin(x)=0
- Express {x} in terms of y where:
- 7*x-2*y=18
- 1*x+6*y=6
- -16*x-12*y=12
- -17*x-12*y=-9
- Graphing y =:
- x^2-6*x+7
-
Identical expressions
- x^ two - six *x+ seven = zero
- x squared minus 6 multiply by x plus 7 equally 0
- x to the power of two minus six multiply by x plus seven equally zero
- x2-6*x+7=0
- x²-6*x+7=0
- x to the power of 2-6*x+7=0
- x^2-6x+7=0
- x2-6x+7=0
- x^2-6*x+7=O
-
Similar expressions
- x^2+6*x+7=0
- x^2-6*x-7=0
x^2-6*x+7=0 equation
The teacher will be very surprised to see your correct solution 😉
The solution
Detail solution
This equation is of the form
A quadratic equation can be solved
using the discriminant.
The roots of the quadratic equation:
$$x_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$x_{2} = \frac{- \sqrt{D} - b}{2 a}$$
where D = b^2 - 4*a*c - it is the discriminant.
Because
$$a = 1$$
$$b = -6$$
$$c = 7$$
, then
Because D > 0, then the equation has two roots.
or
$$x_{1} = \sqrt{2} + 3$$
$$x_{2} = 3 - \sqrt{2}$$
a*x^2 + b*x + c = 0
A quadratic equation can be solved
using the discriminant.
The roots of the quadratic equation:
$$x_{1} = \frac{\sqrt{D} - b}{2 a}$$
$$x_{2} = \frac{- \sqrt{D} - b}{2 a}$$
where D = b^2 - 4*a*c - it is the discriminant.
Because
$$a = 1$$
$$b = -6$$
$$c = 7$$
, then
D = b^2 - 4 * a * c =
(-6)^2 - 4 * (1) * (7) = 8
Because D > 0, then the equation has two roots.
x1 = (-b + sqrt(D)) / (2*a)
x2 = (-b - sqrt(D)) / (2*a)
or
$$x_{1} = \sqrt{2} + 3$$
$$x_{2} = 3 - \sqrt{2}$$
Vieta's Theorem
it is reduced quadratic equation
$$p x + q + x^{2} = 0$$
where
$$p = \frac{b}{a}$$
$$p = -6$$
$$q = \frac{c}{a}$$
$$q = 7$$
Vieta Formulas
$$x_{1} + x_{2} = - p$$
$$x_{1} x_{2} = q$$
$$x_{1} + x_{2} = 6$$
$$x_{1} x_{2} = 7$$
$$p x + q + x^{2} = 0$$
where
$$p = \frac{b}{a}$$
$$p = -6$$
$$q = \frac{c}{a}$$
$$q = 7$$
Vieta Formulas
$$x_{1} + x_{2} = - p$$
$$x_{1} x_{2} = q$$
$$x_{1} + x_{2} = 6$$
$$x_{1} x_{2} = 7$$
Rapid solution
[src]
___ x1 = 3 - \/ 2
$$x_{1} = 3 - \sqrt{2}$$
___ x2 = 3 + \/ 2
$$x_{2} = \sqrt{2} + 3$$
x2 = sqrt(2) + 3
Sum and product of roots
[src]
sum
___ ___ 3 - \/ 2 + 3 + \/ 2
$$\left(3 - \sqrt{2}\right) + \left(\sqrt{2} + 3\right)$$
=
6
$$6$$
product
/ ___\ / ___\ \3 - \/ 2 /*\3 + \/ 2 /
$$\left(3 - \sqrt{2}\right) \left(\sqrt{2} + 3\right)$$
=
7
$$7$$
7
The graph