Question

what is the common factor of the trinomials?
2x^2-x-28 and 2x^2-15x+28

Answer 1

Factor them both and it will be obvious.

Answer 2

how?

Answer 3

First you have to solve both second grade equations, equal them to 0 and procceed, remember
Once you find 2 values of x per each equation, (you'll have 4 in total), you have to put the results as a product, change the signs of all the values of x you get, i mean, if you get +6, to put it as a product it would be (x-6), and so on. Once you have solved both equations, compare both products and extract the common factor, remember, Factor = put as a product.