Answer: Since you are finding the missing side of a rectangle, it is 3.
Step-by-step explanation:
Area of rectangle= (l)(w)
<h2>
Answer:</h2>
The simplified form of the given polynomial equation is:
![-2x^2-x+7](https://tex.z-dn.net/?f=-2x%5E2-x%2B7)
<h2>
Step-by-step explanation:</h2>
We are asked to simplify the given polynomial expression in terms of the variable x.
The algebraic expression is given as:
![(-9x^2+2x+13)-(-7x^2+3x+6)](https://tex.z-dn.net/?f=%28-9x%5E2%2B2x%2B13%29-%28-7x%5E2%2B3x%2B6%29)
On taking out the terms from both the brackets the sign of the terms of the second bracket gets interchanged as there is a negative sign preceding it.
Hence, we get the expression as:
![=-9x^2+2x+13+7x^2-3x-6\\](https://tex.z-dn.net/?f=%3D-9x%5E2%2B2x%2B13%2B7x%5E2-3x-6%5C%5C)
Now on combining the like terms we get:
![=-9x^2+7x^2+2x-3x+13-6\\\\\\=-2x^2-x+7](https://tex.z-dn.net/?f=%3D-9x%5E2%2B7x%5E2%2B2x-3x%2B13-6%5C%5C%5C%5C%5C%5C%3D-2x%5E2-x%2B7)
Every number has three cube roots.
The only real cube root of -64 is <em>-4</em> .
The other two cube roots of -64 are a pair of complex conjugates.
I'm too lazy to calculate them right now, and you didn't ask for them
anyway.