Diketahui polinominal f(x) =2x^3-6x^2+px+7. Jika f(2)=15+f(-1),nilai p=

f(2) = 15 + f(-1)
2(2^3) - 6(2^2) + p(2) + 7 = 15 + (-2 - 6 - p + 7)
3p - 15 = 0
p = 5

periksa lagi ya....

f(2) = 15 + f(-1)
2(2)^3-6(2)^2+p(2)+7 = 15+ 2(-1)^3-6(-1)^2+p(-1)+7
2(8)-6(4)+2p+7 = 15+ 2(-1)-6(1)-p+7
16-24+2p+7 = 15-2-6-p+7
-1+2p = 14-p
2p+p = 14+1
3p = 15
p = 15/3
p = 5

maaf apabila jawabannya salah