Answer:
18550cm²
Step-by-step explanation:
140×110=15400
½×70×90=3150
15400+3150=18550
You just need to plug those expressions inside the formula: it doesn't matter if they're expressions involving a variable instead of plain numbers: the formula becomes

If you want, you can simplify it by expanding the square and then multiply the two parenthesis:

They can help you find a common denominator by the bottoms of each fraction if the top ones don't have the same denominator.
Answer:

Step-by-step explanation:
In the distributive property each value inside the parenthesis will be multiplied by the value outside the parenthesis.
In the expression 3(x - 1) it will look like:

Then we multiply both value separately giving us:

So in conclusion it would be right to assume that.

What? I don't understand what you mean...