Please help me with 4/a, b, c and 5/b

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 - Multiplication can be transformed into difference of squares using the rule: .

- So change the equation using the rule:

- Expand and :

- Calculate and :

So the end equation would be: .

- Multiplication can be transformed into difference of squares using the rule: .

- So change the equation using the rule:

- Expand and :

- Calculate and :

So the end equation would be: .

- Multiplication can be transformed into difference of squares using the rule: .

- So change the equation using the rule:

- Expand :

- Calculate and :

So the end equation would be: .

- Consider . Multiplication can be transformed into difference of squares using the rule: .

- So change the equation using the rule:

- Expand :

- Calculate :

- Use binomial theorem to expand :

- Combine and :

- Consider . Multiplication can be transformed into difference of squares using the rule: .

So change the equation using the rule:

- Expand and :

- Calculate and :

- Combine and :

So the end equation would be: .

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could

step-by-step explanation:

u send me a picture of ur work

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step-by-step explanation: