Question

plz answer as fast as possible
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Answer 1

Step-by-step explanation:

$(i) = > using \: formula \: \\ ( {a}^{2} - {b }^{2} )= (a - b)(a + b) \\ = - 4 {x}^{2} + 81 \\ = - (4 {x}^{2} - 81) \\ = - ( {(2x)}^{2} - {(9)}^{2} ) \\ = - ((2x - 9)(2x + 9)) \\ \\ (ii) = > {t}^{2} {u}^{2} + 10tu + 25 \\ = {t}^{2} {u}^{2} + 5t u + 5tu + 25 \\ = tu( tu + 5) + 5(tu + 5) \\ = (tu + 5)(tu + 5) \\ = tu = - 5, - 5$

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