Question

factorise a^2b^2-a^2-b^2+1​

Answer 1

Answer:

$({a}^{2} - 1)( {b}^{2} - 1)$

Step-by-step explanation:

${a}^{2} {b}^{2} - {a}^{2} - {b}^{2} + 1 \\ = {a}^{2} {b}^{2} - {b}^{2} - {a}^{2} + 1 \\ = {b}^{2} ( {a}^{2} - 1) - ( {a}^{2} - 1) \\ = ( {a}^{2} - 1)( {b}^{2} - 1)$

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