1. x²-10x +21=02. 2x² +24x+70=0
1. x² – 10x + 21 = 0
x² – 7x – 3x + 21 = 0
x ( x – 7) -3 ( x – 7) = 0
(x – 3) (x – 7) = 0
x1 = 3 , x2 = 7
HP : {3, 7}
2. 2x² + 24x + 70 = 0
2x² + 14x + 10x + 70 = 0
2x ( x + 7) + 10(x + 7) = 0
(2x + 10) (x + 7) = 0
2x = -10 x2 = -7
x1 = -5
HP : {-7 , -5}
Jawaban:
1. x²-10x+21=0
(x-3) (x-7)
x-3=0 atau x-7=0
x = 3 x = 7
x1 = 3
x2= 7
2. 2x²+24x+70 dibagi 2
x²+12x+35
(x+7) (x+5)
x+7=0 atau x+5=0
x = -7 x = -5
x1= -7
x2=-5