You can put this solution on YOUR website! Try factoring negative 1 and then make trials to test multiply.
and just focus on the quadratic factor, and try to factor it.
This should mean that 5b+a=-2 and ab=-16 but this does not make the process any easier.
Try different combinations.
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(5x__2)(x__8)---------- 2 and 40; and 16
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(5x__8)(x__2)--------- 10 and 8; and 16. Maybe.
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(5x__4)(x__4)--------- 20 and 4; and 16
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The combination that works including which operations in each binomial factor is , and since you started with a factor of negative 1, your factorization can be: .
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