Question

ans wer 4 th one fast​

Answer 1

Answer:

Your answer of 4th part is given below:

Step-by-step explanation:

First we have to add

2a² + 3b² - c² and 4a² - 3b² + 5c² =  2a²+4a² + 3b² -3b² -c² + 5c²

= 6a² + 4c²

Let  6a² + 4c² be term 1  

 And let a² - b² - c² be term  2  

So we have to subtract term 1 and term 2

That is (6a² + 4c²) - (a²- b² - c²)

Let us open the bracket

6a² +  4c²   -a² + b² + c² = 5a² + 5c² + b²

And your answer is 5a² + 5c² + b²

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Answer 2

please brainliest me please