Question

Nine subtracted from the square of the product of a and b

Answer 1

(ab)^2 - 9

= (ab)^2 - 3^2

= (ab - 3)(ab + 3)

( Using formula: a^2-b^2 = (a+b)(a-b) )

Hope it helps you...

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Answer 2

If it is just if writing into expressions, it becomes ab2-9