Question

$3x {}^{2} - 2(x {}^{2} - 2x) + 2x - 11 = 5$
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Answer 1

$3x^2-2(x^2-2x)+2x-11=5\\\\3x^2-2x^2+4x+2x-11-5=0\\\\x^2+6x-16=0\\\\D/4=9+16=25\; \; ,\; \; x_1=-3-5=-8\; \; ,\; \; x_2=-3+5=2\\\\Otvet:\; \; x_1=-8\; ,\; x_2=2\; .$