Hindi, asked by seyata678, 6 months ago

find the value of ab + bc + ca if , a + b + c = 15 and a² + b² + c² = 77

Answers

Answered by lipshanag66

10

Answer:

sorry ye meri samajh se bahar he.....

Answered by dsk75

2

Answer:

(a+b+c)² = a²+b²+c²+2(ab+bc+ca)

=> (15)² = 77 + 2(ab+bc+ca)

=> 225-77 = 2(ab+bc+ca)

=> ab+bc+ca = 148/2 = 74

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