This quadratic expression can't be factored because its discriminant is less than zero.
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The expression d squared plus 16d plus 48 can be factored as (d + 4)(d + 12).
4(2b+5)
If you mean: x^2 +5x +4 then it is (x+4)(x+1) when factored
(2x+10)(x+4)
Do you need this equation factored or? 2x+3=x+4?