9 x squared minus 16 Y squared
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a2 – b2
= (a – b)(a + b)
= ( 9x - 16y) (9x + 16y)
= 81x^2 + 144xy - 144xy -256y^2
is your right answer
= (a – b)(a + b)
= ( 9x - 16y) (9x + 16y)
= 81x^2 + 144xy - 144xy -256y^2
is your right answer
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