Question

if alpha and bita are roots x²+x-7=0 find value of alpha³+ bita³​

Answer 1

Step-by-step explanation:

ā and b are the roots of equation x²+x-7=0

a=-1

b= 7

now a³+b³= (a+b)(a²+b²-ab)

(-1+7)(-1³+7--1×7)

6(-1+7+7)

6(-1+14)

6(13)

78