Use suitable identity to solve $(6 x - 7) (6 x + 7)$

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Solution

$(6 x - 7) (6 x + 7)$
using identity $(a + b) (a - b) = a^{2} - b^{2}$
$(6 x - 7) (6 x + 7) = (6 x)^{2} - (7)^{2}$
$(6 x - 7) (6 x + 7) = 36 x^{2} - 49$

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