I'm just confused about a couple of rules. For example if I have multiplied a fraction out to get 9(x+4)-2(x+2) does the 2 in the second bracket get multiplied by -2 or 2?
Also if I have this: 2(x+4)(x+2) is it only the x+4 which is doubled? Or do you work out the quadratic and multiply the whole thing by two?
Thanks
I'm going to show you the first example step by step. The following examples can be solved in exactly the same way:
1. Domain: The denominator must be unequal to zero. Therefore
2. The common denominator of the fractions is . Change the fractions so they have both the same denominator:
3. Multiply both sides of the equation by the common denominator to get rid of the fractions:
4. Expand all brackets:
5. Collect like terms:
6. Divide by the leading factor of x: