Jawabanmu

2014-03-11T21:33:22+07:00
 x²-(p+3)x+(2p+2)=0 
maka :persamaan (1) X1 + X2 = p + 3
persamaan (2) X1  x X2 = 2p + 2

X1 = 3 X2
X1 + X2 = p + 3
3 X2 + X2 = p + 3
4 X2 = p + 3
X2 = p + 3 diper 4

X1 x X2 = 2p + 2
3 x X2 x X2 = 2p + 2
3 x X2 kuadrat = 2p + 2
3( p + 3 di per 4) kuadrat = 2p + 2

3 x ( p kuadrat + 16p + 9 diper16 ) = 2p + 2
3p kuadrat + 18p + 27 = 32p + 32
3p kuadrat - 14p - 5 = 0
(3p + 1)(p - 5 ) = 0
p1 = -1/3 atau p2 = 5
p asli maka p = 5

by : kak nanda