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