If we want to solve for x given: (5x + 4)2 - 2 = 7 Then is it best to expand first? When I do this I get: 25x^{2}+ 40x + 7=0 Should I factor after this? Thanks
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you can expand, combine like terms, then factor. or ... $(5x+4)^2 = 9$ $|5x+4| = 3$ $5x +4 = 3 \implies x = -\dfrac{1}{5}$ $5x+4 = -3 \implies x = -\dfrac{7}{5}$