Jika a + b = 1 dan a^2 + b^2 = 5, maka a^3 + b^3 adalah

a+b=1
misal:a=-1,b=2
a+b=-1+2=1
a²+b²=-1²+2²=1+4=5
mka,a³+b³=-1³+2³
=-1+8
=7

• a + b = 1
• a² + b² = 5

(a + b)² = a² + b² + 2ab
(1)² = 5 + 2ab
1 = 5 + 2ab
2ab = -4
ab = -2

a³ + b³ = (a+b)³ - 3ab(a+b)
= (1)³ - 3(-2)(1)
= 1 + 6
= 7