tolong jawab plissss
Penyelesaian:
x1+x2=-b/a
x1.x2=c/a
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x1²x2+x1x2²
=x1(x1.x2)+x2(x1.x2)
=(x1+x2)(x1.x2)
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1/x2+1/x2=(x1+x2)/(x1.x2)
3/x1+3/x2=3(x1+x2)/(x1.x2)
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a.)x1+x2=-(-5)/2=5/2=2,5
b.)x1.x2=1/2=0,5
c.)(x1+x2)(x1.x2)=(2,5)(0,5)=1,25
d.)(x1+x2)/(x1.x2)=2,5/0,5=2,5/½=2,5×2/1=5
e.)3(x1+x2)/(x1.x2)=3(2,5)/0,5=7,5/½=7,5×2=15
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