Question

If a+b-c=9 and a^2+b^2+c^2=29 find the value of ab-bc-ca

Answer 1

Answer:

ab+BC+CA=23 ans.

Step-by-step explanation:

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Answer 2

Answer:

-2

Step-by-step explanation:

a+b+c=5 a

2

+b

2

+c

2

=29

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

25=29+2(ab+ac+bc)

2(ab+bc+ac)=−4

ab+bc+ac=−2