Question

Tolong jawaban utk soal ini yah ..
no.7,8,9 .. trmksh ..

Answer 1

Ma’af Cuma bisa bantu nomor 7 aja., ;)
N0.7
2x²+ 5x+12=0
a=2, b=5, c=12
misal:  
1. α+β= -b/a= -5/2
2. α.β = c/a = 12/2=6
Kemudian,
1.misal : (x1 + x2 )=(2α+4) + (2β+4)                                 
 = 2α+2β+8                                  
= 2 (α+β)+8                                
  = 2 (-5/2)+8 = 3
2. misal : (x1 . x2 )= (2α+4)x(2β+4)                                 
  = 4αβ+ 8α + 8β +16                                 
 =  4(αβ) + 8(α+β) +16                                  
 = 4 (6) + 8 (-5/2) + 16 = 20
Rumus menyusun persamaan kuadrat:
X²- (x1 + x2)x + x1.x2 =0
X²- 3 + 20 =0J
awabannya:  D