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I only need help with a through d. Please help me, I would really appreciate it.

I only need help with a through d. Please help me, I would really appreciate it.-example-1
User Lukeis
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Hello,


3x^3+x^2+15x+5\\ =(3x^3+15x)+(x^2+5)\\ =3x(x^2+5)+1(x^2+5)\\ =(x^2+5)(3x+1)
User Peter Zhou
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