153656

For 2d,
10x^2-6x+c
Firstly we must find two numbers and these numbers must be able to multiply to produce a multiple of 10. This is because we know that in order for c to be an integer, the product must divide by 10 and give a whole number. Secondly, the two numbers must add up to give -6.

An example is -10 and 4

They multiply and give -40 and add to -6. -40 is a multiple of 10 meaning if you divide by 10, you get -4 which can be a solution for c, considering it is an integer.
c = -4
Answer = (10x+4)(x-1)