# Tagged Questions

0answers
58 views

### Rearrange this equation so x is the subject [closed]

I have this equation: y = 0.1x^3-0.2x^2 + 0.4x + 100 Can someone rearrange this equation so x is the subject. Thanks.
2answers
152 views

### Eliminate several variables between five Conic_section equations

I want to eliminate x1, x2, y1, y2 between these 5 equations. I tried ...
4answers
511 views

### How to get exact roots of this polynomial?

The equation $$64x^7 -112x^5 -8x^4 +56x^3 +8x^2 -7x - 1 = 0$$ has seven solutions $x = 1$, $x = -\dfrac{1}{2}$ and $x = \cos \dfrac{2n\pi}{11}$, where $n$ runs from $1$ to $5$. With ...
1answer
439 views

### Reduce an equation by putting a new variable

I have the following equation given: $$(26-x)\cdot\sqrt{5x-1} -(13x+14)\cdot\sqrt{5-2x} + 12\sqrt{(5x-1)\cdot(5-2x) }= 18x+32.$$ In order to solve it, I want to substitute \$t = \sqrt{5x - ...
2answers
1k views

### How to convert a system of parametric equations to a normal equation?

For example, I have a system of parametric equations (R is a constant number) : ...
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