8*8=64 не хватает
<span>8*6+12*2=48+24=72</span>
2x(3+8x)-(4x-3)(4x+3)=1,5x
6x+16x²-16x²+9-1,5x=0
4,5x=-9
x=-2
![\left \{ {{3x-6\ \textgreater \ 0} \atop {5-x \leq 0}} \right.\\\\ \left \{ {{3x\ \textgreater \ 6} \atop {-x \leq -5}} \right.\\\\ \left \{ {{x\ \textgreater \ 2} \atop {x\ \textgreater \ 5}} \right.](https://tex.z-dn.net/?f=+%5Cleft+%5C%7B+%7B%7B3x-6%5C+%5Ctextgreater+%5C+0%7D+%5Catop+%7B5-x+%5Cleq+0%7D%7D+%5Cright.%5C%5C%5C%5C+%5Cleft+%5C%7B+%7B%7B3x%5C+%5Ctextgreater+%5C+6%7D+%5Catop+%7B-x+%5Cleq+-5%7D%7D+%5Cright.%5C%5C%5C%5C+%5Cleft+%5C%7B+%7B%7Bx%5C+%5Ctextgreater+%5C+2%7D+%5Catop+%7Bx%5C+%5Ctextgreater+%5C+5%7D%7D+%5Cright.+++)
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2 5
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x ∈ [5 ; + ∞)
Ответ: 5
Уверена 100% что правильно