exam Maths Puzzle Numerical Ability

If x2 - 13x + 42 = (x + A)(x + B), then A + B =

-42
-1
13
42
none of these

thank you

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exam Other Question

Can you give me a hand with this one? Thanks!

x/x-2 = 2/x-3 Solve for x

thanks! can someone please help me with this question;

Find and simplify the difference quotient f(x+h)-f(x) / h , h =(with slash through the = sign) 0 for the given function.

f(x) = 3x - 9

a. 3 + 6(x-9)/h
b. 0
c. 3
d. 3 + -18/h