Question

If a^2 + b^2 + c^2 = 26 and a+b+c = 8 find the value of ab+bc+ca

Answer 1

★(a+b+c)²=a²+b²+c²+2(ab+bc+ca)

=> (ab+bc+ca)=(a+b+c)²-(a²+b²+c²)

=>(ab+bc+ca)=(8)²-26

=>(ab+bc+ca)=64-26.

.°. ab+bc+ca =38.

Answer 2

Answer:

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