2x4-5x3+(p+3)x2+p habis dibagi x+2 .Hitunglah nilai p

jawab
suku banyak
x +2 =0
x = - 2

f(x)  = 2x⁴ - 5x³ + (p+3)x² + p 
f((-2)= 0
2(-2)⁴- 5(-2)³ + (p+3)(-2)² + p = 0
32 + 40 +4(p+3) + p = 0
72 + 4p +12 + p = 0
84 + 5p = 0
p= - 84/5
p = - 16,8