lim X-> 4 x² - 8x + 16 x² - 6x +8
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[tex]\lim \: x\to4 \\ \: \: \: \: \: \: \: x {}^{2} - 8x + 16x {}^{2} - 6x + 8 \\ \\ = 4 {}^{2} - 8(4) + 16(4 {}^{2} ) - 6(4) + 8 \\ \\ = ( 4\times4) - 32 + 16(4 \times 4) -24 + 8 \\ \\ = 16 - 32 + 16(16) - 24 + 8 \\ \\ = - 20 + 256 - 24 + 8 \\ \\ = 236 - 24 + 8 \\ \\ = 260 + 8 \\ \\ = \red{268}[/tex]
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