Question

If a+b+c=10 and a²+b²+c²=30 find ab+bc+ca=?

Answer 1

Answer:

Ur answer is 35

Step-by-step explanation:

(a+b+c) ²=a²+b²+c²+2(ab+bc+ca)

By putting the values,

(10)²=30+2(ab+bc+ca)

100-30=2(ab+bc+ca)

70\2=ab+bc+ca

35=ab+bc+ca

I think u are in class 9,am I right??

Hope it helps

Plz mark it as brainliest answer