exam Maths Puzzle Numerical Ability

i am doing factoring using the distributive property
so i have a problem like this
7x+49

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exam Other Question

factor:

40x^2-68x-80

choices:
1) 4(2x+5)(5x-4)
2) -4(2x+5)(5x+4)
3) -4(2x-5)(5x+4)
4) 4(2x-5)(5x+4)

thank you What is the "highest unobtainable price" (HUP) for $3/$8?