Question

If a + b = 3 and ab = 2, find the values of (ii) a – b (iii) a 2 - b 2 (iv) a 3 + b 3

Answer 1

Answer:

a=2&b=1

ii)a - b = 1

iii)a2-b2=2(a-b)=2(2-1)=2*1=2

iv)a3+b3=3(a+b) =3(2+1)=3(3)=3*3=9