Need help simplifying (5x-4)(2x-1)-(x-7)(3x+5)

Question

Every way I try to do it I get a different answer. I know the answer is supposed to be

7x to the power of 2 +3x+39   (can't write exponents...?) I want to know how to get to that answer please.

Answer 1

(5x - 4)(2x - 1) - (x - 7)(3x + 5)

FOIL on the first part

10x^2 - 5x - 8x + 4 - (x - 7)(3x + 5)

10x^2 - 13x + 4 - (x - 7)(3x + 5)

FOIL on the second part

10x^2 - 13x + 4 - (3x^2 + 5x - 21x - 35)

Now the - hits each piece of the second part like this

10x^2 - 13x + 4 - 3x^2 - 5x + 21x + 35

Combine the x^2's

7x^2 - 13x + 4 - 5x + 21x + 35

Combine the x's

7x^2 + 3x + 4 + 35

Combine the numbers without x's

7x^2 + 3x + 39