Question

factorise x square -9b square
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Answer 1

Answer:

$( {x}^{2} - (9 {b})^{2} ) \\ = > {(x - 9b)}^{2} \\ = > {(x)}^{2} - 2(x)(9b) + (9)^{2} \\ = > {x}^{2} - 18xb + 81$