Question

2) (a+b) (a-b) Ca²+b?) (a" +64) Evaluate​

Answer 1

Answer:

Step-by-step explanation:

Given a+b+c=12

a^2+b^2+c^2=64

Then ab+bc+ca=?

a+b+c=12

Squaring on both sides

(a+b+c)^2=(12)^2

a^2+b^2+c^2+2(ab+bc+ca)=144

64+2 (ab+bc+ca)=144

2(ab+bc+ca)=80

ab+bc+ca=40

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