exam Maths Puzzle Numerical Ability

Factor: 8x^3-40x^2-48
I know I can take the 8 out, then I get confused

8(x^3-5x^2-6) then what???

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exam Other Question

can you find the next 3 term in this sequence

1,5,4,20,19,_,_,_ find the sum of 3 consecutive odd integers such that 4 times the sum of the 1st and second is 17 more than 7 times the 3rd