Question

if a = 5 + 2 root 6 if b is equal to 5 minus 2 root 6 find a cube plus b cube​

Answer 1

Step-by-step explanation:

a=5+2√6 ,b=5-2√6

a^3+ b^3=(a+b) ^3 -3ab(a+b)

=(5 +2√6 +5-2√6) ^3 -3(5+2√6) (5-2√6) (5+2√6+5-2√6)

=(10) ^3 -3(5^2 -2√6^2) (10)

=1000 -30(25-24)

=1000 -30

=970 Ans