A (real) square root of a number is always positive, so only (C) has no solutions.
Take the tax (6$) and divide it by the pretax(75$) and take that number and multiply it by 100 and you get your percentage (8%)
Answer: FIRST OPTION
Step-by-step explanation:
You must keep on mind that, according the exponents properties, when you multiply two powers with equal base, you must add the exponents.
Then:
- Apply the distributive property as you can see below:
![(x*x^2)-(x*2x)-(x*3)-(4*x^2)+(4*2x)+(4*3)=x^3-2x^2-3x-4x^2+8x+12](https://tex.z-dn.net/?f=%28x%2Ax%5E2%29-%28x%2A2x%29-%28x%2A3%29-%284%2Ax%5E2%29%2B%284%2A2x%29%2B%284%2A3%29%3Dx%5E3-2x%5E2-3x-4x%5E2%2B8x%2B12)
-Add like terms, then you obtain:
![x^3-2x^2-3x-4x^2+8x+12\\x^3-6x^2+5x+12](https://tex.z-dn.net/?f=x%5E3-2x%5E2-3x-4x%5E2%2B8x%2B12%5C%5Cx%5E3-6x%5E2%2B5x%2B12)