Mister Exam
Other calculators
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How to use it?
- Equation:
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Equation (x+7)*(x-1)=0
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Equation x/3+x/4=-21
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Equation sin(x)=0
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Equation -5*(3*x-2)/7+4=7*x-4/9*(x-3)
- Express {x} in terms of y where:
- 14*x+3*y=-4
- 14*x-4*y=14
- 1*x+20*y=6
- -2*x+4*y=3
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Identical expressions
- laplace(x)=(thirty-nine / forty)
- laplace(x) equally (39 divide by 40)
- laplace(x) equally (thirty minus nine divide by forty)
- laplacex=39/40
- laplace(x)=(39 divide by 40)
laplace(x)=(39/40) equation
The teacher will be very surprised to see your correct solution 😉
The solution
You have entered
[src]
/ x \
1 + erf|-----|
| ___|
\\/ 2 / 39
-------------- = --
2 40
$$\frac{\operatorname{erf}{\left(\frac{x}{\sqrt{2}} \right)} + 1}{2} = \frac{39}{40}$$
Rapid solution
[src]
___ /19\
x1 = \/ 2 *erfinv|--|
\20/
$$x_{1} = \sqrt{2} \operatorname{erfinv}{\left(\frac{19}{20} \right)}$$
x1 = sqrt(2)*erfinv(19/20)
Sum and product of roots
[src]
sum
___ /19\
\/ 2 *erfinv|--|
\20/
$$\sqrt{2} \operatorname{erfinv}{\left(\frac{19}{20} \right)}$$
=
___ /19\
\/ 2 *erfinv|--|
\20/
$$\sqrt{2} \operatorname{erfinv}{\left(\frac{19}{20} \right)}$$
product
___ /19\
\/ 2 *erfinv|--|
\20/
$$\sqrt{2} \operatorname{erfinv}{\left(\frac{19}{20} \right)}$$
=
___ /19\
\/ 2 *erfinv|--|
\20/
$$\sqrt{2} \operatorname{erfinv}{\left(\frac{19}{20} \right)}$$
sqrt(2)*erfinv(19/20)
The graph