common.or
common.or
a + b + c = 9 এবং ab + bc + ca = 31 হয়, তবে a2+b2+c2=?
Given that,
a + b + c = 9
ab + bc + ca = 31
Find out, a2 + b 2 + c2 =?
= (a + b + c)2 - 2(ab + bc + ca)
= 92 - 2 × 31
= 19
