I need help with two equations! It's review that I haven't done in months and am terribly confused.

(7x^3 - 5x +2) - (5x^3 - 4x^2 +6x -7)

and this one is factoring: x^2 - 7x - 30

Question

I need help with two equations! It's review that I haven't done in months and am terribly confused. 

(7x^3 - 5x +2) - (5x^3 - 4x^2 +6x -7) 

and this one is factoring: x^2 - 7x - 30

akashdeepdeb · Answer

2) Find 2 numbers that multiply to 30 but add/subtract up/down to 7!
In this case 10 and -3 right?

akashdeepdeb · Answer

Put it in the equation x2 - (10-3)x - 30!
Then open the brackets and group the terms!
[IT WOULD BE FACTOISED] :)

anonymous · Answer

Thank you!