Question

if a + b - c = 5 and a2 +b2 +c2 = 29 find ab - bc - ca

Answer 1

Question :

if a + b - c = 5 and a² +b² +c² = 29 find ab - bc - ca

To find :

ab - bc - ca

Formula Used :

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

Solution :

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

By putting the values we get,

• (5)² = 29 + 2(ab - bc - ca)

• - 2(ab - bc - ca) = 29 - 25

• ab - bc - ca = 4/-2

• ab - bc - ca = - 2

• So the value of (ab - bc - ca) is - 2

Answer 2

Answer:

refer to the attachment

Step-by-step explanation:

hiya!!