Question 616231
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Hi, 
Factor the expression 16x^2-72xy+81y^2 into a product of binomials.
{{{ 16x^2-72xy+81y^2 =(4x-9y)(4x-9y)= (4x-9y)^2 }}}
                       F	First terms 16x^2
                       O	Outside terms -36xy
                       I	Inside terms  -36xy
                       L	Last terms     81y^2