What’s equivalent to (2x-5) (3x+1)

Question

I’ve worked out the question which gave me 6x^2 - 11x -10 but my homework options give me

A) 6x^2 -13 -5

B) 6x^2 -8x -4

C) 6x^2 - 5

D) 6x^2 -17x -5

Answer 1

Use FOIL

correct answer is 6x^ -13x - 5

Possibly you copied A wrong, or A is a typo at some point. It looks like what would have been the only correct answer

FOIL means multiply the 1st two terms in each factor, then the outside plus inside terms, then the last terms

last terms are -5 and 1, their product = -5. That eliminates B

Outside terms' product is 2x. Inside terms' product = -15x. Add them it's -15x+2x = -13x