Question

Dik : X1X2 akar akar persamaan kuadrat
x^2+5x-2=0 tentukan :
a. X1+X2
b. X1X2
c. 1/X1+1/X2
d. X1^2+X2^2
e. X1/X2+X2/X1
f. X1-X2
g. X1^3+X2^3

Answer 1

A.x1+x2=-b/a=-5/1=-5 B.x1.x2=c/a=-2/1=-2 C.1/x1+1/x2=x2+x1/x1.x2=-5/-2=5/2=2,5 D.x1^2+x2^2=(x1+x2)^2-2x1.x2=-5^2-2(-2)=25+4=29 E.x1/x2+x2/x1=x1^2+x2^2/x1.x2=)x1+x2)^2-2x1.x2/x2.x1=29/-2