35xy / 49y in simplest form is 5x/7
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73y + 144y + 49y=266y
25x2-49y2 is the difference of two squares and can be factored as:- (5x-7y)(5x+7y)
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4x^(2) + 28xy + 49y^(2) -> (2x)^(2) + 28xy + (7y)^2 Split into brackets ( 2x + 7y)(2x + 7y) If you applyuFOIL you will find toy come to '28xy'. The clue to this problem is to note that '4' ^ '49' are both squared numbers.