Question

solve the problem
${x }^{2} - 15x + 54 = 0$
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Answer 1

${x}^{2} - 15x + 54 = 0 \\ {x }^{2} - 6x - 9x + 54 = 0 \\ x(x - 6) - 9(x - 6) = 0 \\ (x - 9)(x - 6) = 0 \\ x = 9 \\ \: or \\ x = 6$