book Maths Puzzle Numerical Ability

which of the following is one of the two binomial factors of 6s2+40s-64?

(a). 6s-12 (C).3s-4
(b). 2s-16 (D). s+10

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book Other Question

in our class for algebra 2 we are working on probablity and also permutations and combinations.

a test contains 20 questions. the teacher asks you to answer 15 questions. How many different ways can you answer 15 questions.
Finding three ordered pairs that satisfy equation. X + Y = 7

I have tried using Algebrator on this but I cannot figure out where 3 ordered pairs come from. (0,7) (7,0) yes but what is the last? (X + y = 7)