It’s the quadratic formula because it’s give directly the zeros of a function
I don’t think he did distributive property
f(x) + g(x) =
4x + 3
3x^2 + 2x - 4
----------------------------------
3x^ +6x -1
Answer: 3x^ +6x -1
Either you typed something wrong in the problem or the answer
The formula for triangle area is b•h/ 1/2. so you would do 12•5=60. then divide that by 2 to get 30