exam Maths Puzzle Numerical Ability

I need help solving:
x(x+2)(x+4)=315
i know the answer, i just have to figure out how to get there other than trial and error.

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exam Other Question
Coefficients are to ____ as exponents are to ____?

I believe it terms and factors.. Perform Gauss-Jordan elimination on this augmented matrix.

3 -4 2
0 -1 7
3/2 -2 1



Guass-Jordan made more sense in equation form.