Question

subtract the sum of 9b2-3c2 and 2b2 +bc -2c2 from the sum of 2b2 -2bc -c2 and c2+2bc-b2

Answer 1

Answer:

11 b2 - 5c2 + b2

Step-by-step explanation:

First finding the sum of 9b2-3c2 and 2b2 +bc -2c2

9b2-3c2 + 2b2+bc-2c2

11b2 - 5c2 + 2b2 ------------------------ 1

Finding the sum of 2b2 -2bc -c2 and c2+2bc-b2

2b2 -2bc -c2 + c2+2bc-b2

= 2b2 - b2 -2bc + 2bc - c2 + c2

= b2 ---------------------------------------- 2

subtracting 1 and 2

11b2 - 5c2 + 2b2 - b2

11 b2 - 5c2 + b2