exam Maths Puzzle Numerical Ability

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

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exam Other Question

Given: WS bisects angle RWP
Prove: angle RWS is congruent to angle PWS
i am doing factoring using the distributive property
so i have a problem like this
7x+49