Question

Why would "-7" in the expression (x^2+3)-(x-7) become positive?

(This is a genuine question not a test one) ​

Answer 1

x is the variable that's representing a number so -7 would not become posting

Please help me with with this science question

How does potassium dihydrogen phosphate affect soil, water, and air?

Answer 2

You would use the distributive property with the negative. So the second x becomes negative, but since the 7 is already negative it becomes positive. Think of it as if you put the two dashes together you can make a plus sign.