Akar akar persamaan kuadrat x²-10x+22=0 adalah....

Akar akar persamaan kuadrat x²-10x+22=0 adalah….

X²-10+20=0
a=1
b= -10
c=20
a)x1+x2
$= frac{ - b}{a} = - frac{ - ( - 10)}{1} = 10$

b)x1×x2
$= frac{c}{a} = frac{20}{1} = 20$

c)
$frac{1}{x1} + frac{1}{x2} \ = frac{x2 + x1}{x1 times x2} = frac{10}{20} = frac{1}{2}$

d)x1²+x2²
=(x1+x2)²–2 . x1 . x2
=(10)²–2 . 20
=100–40
=60