Разложите на множители многочлен:
16x^2 - 8x + 1 - 49y^2

Вычислите:
7,131^2 - 4,131^2

16x² -8x +1 -49y² =(4x-1)² - (7y)² =(4x -1-7y)(4x -1+7y)   [ (4x-7y-1)(4x +7y-1) ] .
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7,131² -4,131² =(7,131 - 4,131)(7,131+4,131) =3*11,262  =33,786.