This is considered an expression "x^2 - 49", or alternatively a function of the variable x. In that sense, when you apply the expression to a certain input (such as x=3) you obtain a number (3^2-49 = -40).
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(x - 7) is.
7 x 7 = 49
simplified it would equal: 24x to the third power - x to the second power - x to the sixth power - 34
49 - x2 = -(x2 -49) = - (x-7)(x+7) divide by x -7 Answer: -(x+7) = -x-7
x4-49 is the difference of two squares when factored as (x2-7)(x2+7)