Given that a and B are the two real roots of the equation x with square-2x-4 = 0, find the cubic value of a + 8b + 6 Tip: A is the root of the equation, the square of a brought into the class = 2A + 4, using the characteristics of the lion can reduce the order

a^2=2a+4
a^3=a^2*a=2a^2+4a=2(2a+4)+4a=8a+4
From the Weida theorem
a+b=2
So a ^ 3 + 8b + 6
=8a+4+8b+6
=8(a+b)+10
=8*2+10
=26