15a + 20ab = zero
5a(3 + 4b) = zerp
5a=zero ............ a=zero
or
3 + 4b = zero
4b = -3 ............ b=-3/4
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10 + 15a * * * * * No! It is 10 + n/15
Do you mean (3ax-15a)+(x-5)?If so, then this is simply a matter of factoring by grouping, which you should have learned in pre-algebra.You should show these steps in your work:1. (3ax-15a)+(x-5)- beginning equation2. 3a(x-5)+1(x-5)- factoring it out3. (3a+1)(x-5)- rule of factoring by groupingYou should learn this method, because it is very simple and helps you a lot in factoring chapters.
5 x 3a= 15a
6
If your referring to addition, then it would be 8a+14b. If your multiplying it would be, 15a*24b simplified to 360ab.