Page 25 - PERSAMAAN KUADRAT_Neat
P. 25
∙ =
2
1
−8
∙ =
1
2
1
∙ = −8
1
2
x1 + x2 = (x1 + x2) – 2x1x2
2
2
2
= 7 – 2(-8)
2
= 49 – (-16)
= 49 + 16
= 65
