Pls help pls show handwritten work with full explanation thank you and this is factorise

Question 1

Pls help

pls show handwritten work
with full explanation
thank you
and this is factorise

Question 2

$\huge{ \mathfrak{  \underline{ Answer} \:  \:  ✓ }}$

Question 1 :

$\small(a {}^(2) b {}^(2) + 1 + ab - c)(a {}^(2) {b}^(2) + 1 - ab + c)$

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$\small a⁴b⁴ + 1 + a²b² - c² + 2abc$

$\small( a⁴b⁴+ 1 ) + a²b² - c² + 2abc$

$\small[ (a²b²)² + 1² ] + a²b² - c² + 2abc$

$\small(a²b² + 1 + 2a²b² - 2a²b²) + a²b² - c² + 2abc$

$\small(a²b² + 1)² - 2a²b² + a²b² - c² + 2abc$

$\small(a²b² + 1)² - a²b² - c² + 2abc$

$\small(a²b² + 1)² - (a²b² + c² - 2abc)$

$\small(a²b² + 1)² - (ab - c)²$

$\small(a²b² + 1 + ab - c) (a²b² + 1 - ab + c)$

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$\mathrm{ ☠ \: TeeNForeveR \:☠ }$

Question 3

Answer:

This may help you

look it once.

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