Question 472411
aČ - 49
--------
a - 7


aČ - 49 is a "difference of two squares".....it factors into (a + 7)(a - 7)


(a + 7)(a - 7)
-------------- {factored the top into two binomials}
a - 7


= a + 7 {cancelled a - 7 on top and bottom}
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