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-5(4) right ?

No not this time I think you have copied your question incorrectly
it should be
a^2 - a - 20
right ?

no it has 5 in this one

i see it's prime so how do i show work

is the answer
\[5+\sqrt{105}/2,5-\sqrt{105}/2\]

7.623,-2.623

yes or no?

no because it's prime

but it can be solved by discriminant method

it just said factor and show work so i don't think i have to use that .

ya??got it!