The expansion of ( 9x - 5t ) ( 9x + 3t ) is ___________
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Step-by-step explanation:
(9x-5t) (9x+3t)
=(9x)^+[(-51)+(3t) (9x)+(-5t)×(3t)
81x^+(-2t)(9x)-15t^
81x^-18xt-15t^
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