Question

please help me in this ​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

(a + b + c)2=a2+b2+c2+2ab+2bc+2ca

(0)2=20 + 2(ab+bc+ca)

0-20 = 2(ab + bc + ca )

-20 = 2(ab + bc + ca )

-20/2 = ab + bc + ca

-10 = ab + bc + ca

ab + bc + ca = -10 ans

Step-by-step explanation:

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