Try all the factoring techniques that you have been taught. If none work then it is prime (cannot be factored),
try looking for (1) a greatest common factor
(2) special binomials ... difference of squares, difference (or sum) of cubes
(3) trinomal factoring techniques
(4) other polymonials look for grouping techniques.
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If a number cannot be factored it is a prime number.
It is (x+4)(x+5) when factored
You can evaluate a polynomial, you can factorise a polynomial, you can solve a polynomial equation. But a polynomial is not a specific question so it cannot be answered.
15j2(j + 2)
If you mean: x2+3x+2 then it is (x+1)(x+2) when factored