Please solve question no.33.

Dear Student,


Given that,

a²+b²+c²=125
ab+bc+ca=50

Aa we know,
(a+b+c)²=a²+b²+c²+2(ab+bc+ca)
⇒(a+b+c)²=125+(2*50)
⇒(a+b+c)²=125+100=225
⇒(a+b+c)=$\sqrt{225}$ =∓15



Regards