Your problem is 3 (3x^2 + 1x - 5).
In a case like this, what you need to do is multiply each part of the polynomial by 3.
3 (3x^2) = 9x^2
3 (1x) = 3x
3 (-5) = -15
So, you are left with this:
9x^2 + 3x - 15
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