\(=\left[\left(5x-4\right)-7\right]\left[\left(5x-4\right)+7\right]\\ =\left(5x-4-7\right)\left(5x-4+7\right)\\ =\left(5x-11\right)\left(5x+3\right)\)
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\(\left(5x-4\right)^2-49\)
=(5x-4-7)(5x-4+7)
=(5x-11)(5x+3)
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