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x² -(x₁+x₂)x+(x₁.x₂)
a. -2 dan 4
x² -(-2+4)x+(-2.4)= x² -2x-8
e. 4 dan 8
x² -(4+8)x+(4.8)= x² -12x+32
3. ax₂+bx +c
berarti :
x1+x2 = -b/a
x1x2=c/a
x1-x2 = = ₉
a. persamaan baru jika akr2nya 2x1+2x2
x² -(2x₁+x₂2)x+(2x₁.2x₂) = x² -(2(x₁+x₂))x+4(x₁.x₂)
= x² -2(-b/a)x+4(c/a)
= x² +2b/a x+4c/a
kita dapat x² +2b/a x+4c/a = 0 (sama2 kalikan a)
ax² +2bx+4c = 0
b. persamaan baru jika karnya x1-x2 dan x1x2
x² -(x1-x2+x1x2)x+(x1-x2.x1x₂)
= x² -( +c/a)x+(. c/a)
= x₂ -+
=