Question

a+b+c=12and a2+b2+c2=64 then ab+bc+ca =?​

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Answer:

(a+b+c)²= a²+b²+c²+2(ab+bc+ca)

Let ab+bc+ca =x

(12)²=64+2(x)

144-64=2x

80=2x

x=40

Therefore, ab+bc+ca = 40.