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(2x+4)(x+3) - (x+23)(x-1) = 0
2x^2 +10x +12 - (x^2 +22x - 23) = 0
x^2 - 12x + 35 = 0
x1+x2 = 12
x1x2 = 35
x1^2 + x2^2 = (x1+x2)^2 - 2(x1x2) = (12)^2 - 2(35)
= 144 - 70 = 74