Question

tap to see and answer question no 11and12​

Answer 1

Answer:

11. -10b²+5c²-bc

12. 9x³/4y³

Hope it's helpful.

Answer 2

Step-by-step explanation:

the sum of = 9b^2-3c^2 + 2b^2+bc-2c^2

= 11b^2-5c^2+bc

the sum of = 2b^2-2bc-c^2 + c^2+2bc-b^2

= b^2

subtract = 11b^2-5c^2+bc from b^2

= b^2 -(11b^2-5c^2+bc)

= b^2-11b^2+5c^2-bc

= 10b^2+5c^2-bc

i hope it will help you

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