Lanjutan Materi Pertidaksamaan Berkaitan Materi Pertidaksamaan Kuadrat

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silahkan buka di sini

A. PERTIDAKSAMAAN KUADRAT

Bentuk Umum:{ax2+bx+c<0ax2+bx+c0ax2+bx+c>0ax2+bx+c0

B. PENYELESAIAN PERTIDAKSAMAAN KUADRAT

ax2+bx+c...0diubah menjadiax2+bx+c=0a(xx1)(xx2)=0x=x1ataux=x2

PertidaksamaanHimpunan Penyelesaian denganx1<x2ax2+bx+c<0{x|x1<x<x2,xR}ax2+bx+c0{x|x1xx2,xR}ax2+bx+c>0{x|x<x1ataux>x2,xR}ax2+bx+c0{x|xx1atauxx2,xR}

CONTOH SOAL

Tentukan himpunan penyelesaian \textbf{PtKSV}(Pertidaksamaan Linear Satu Variabel) berikut ini!a.x26x+8<0b.x26x+80c.x26x+8>0d.x26x+80Jawab:

x26x+8...0diubah menjadix26x+8=01(x2)(x4)=0x=2ataux=4

\begin{array}{ll}\\ &\begin{array}{|l|c|c|}\hline \textrm{Pertidaksamaan}&\textrm{HP dengan}\: \:\left (2<4 \right )&\textrm{Selang/Interval}\\\hline x^{2}-6x+8< 0&\left \{ x|2<x<4,\: x\in \mathbb{R} \right \}&\begin{array}{ll|llll|llll}\\ &\multicolumn{2}{c}{.}&&&\multicolumn{2}{c}{.}&\\ &\multicolumn{2}{r}{.}&&&\multicolumn{2}{l}{.}&&\\\cline{3-6} &+&&-&-&&+&+&\\\hline &\multicolumn{2}{r}{2}&&&\multicolumn{2}{l}{4}&& \end{array} \\\hline x^{2}-6x+8\leq 0&\left \{ x|2\leq x\leq 4,\: x\in \mathbb{R} \right \}&\begin{array}{ll|llll|llll}\\ &\multicolumn{2}{c}{.}&&&\multicolumn{2}{c}{.}&\\ &\multicolumn{2}{r}{.}&&&\multicolumn{2}{l}{.}&&\\\cline{3-6} &+&&-&-&&+&+&\\\hline &\multicolumn{2}{r}{\textcircled{2}}&&&\multicolumn{2}{l}{\textcircled{4}}&& \end{array} \\\hline x^{2}-6x+8> 0&\left \{ x|x<2\: \: \textrm{atau}\: \: x>4,\: x\in \mathbb{R} \right \}&\begin{array}{ll|llll|llll}\\ &\multicolumn{2}{c}{.}&&&\multicolumn{2}{c}{.}&\\ &\multicolumn{2}{r}{.}&&&\multicolumn{2}{l}{.}&&\\\cline{1-2}\cline{7-9} &+&&-&-&&+&+&\\\hline &\multicolumn{2}{r}{2}&&&\multicolumn{2}{l}{4}&& \end{array} \\\hline x^{2}-6x+8\geq 0&\left \{ x|x\leq 2\: \: \textrm{atau}\: \: x\geq 4,\: x\in \mathbb{R} \right \}&\begin{array}{ll|llll|llll}\\ &\multicolumn{2}{c}{.}&&&\multicolumn{2}{c}{.}&\\ &\multicolumn{2}{r}{.}&&&\multicolumn{2}{l}{.}&&\\\cline{1-2}\cline{7-9} &+&&-&-&&+&+&\\\hline &\multicolumn{2}{r}{\textcircled{2}}&&&\multicolumn{2}{l}{\textcircled{4}}&& \end{array} \\\hline \multicolumn{3}{|c|}{\begin{aligned}\textbf{Catatan: }&\textrm{Angka yang dilingkari termasuk}\\ &\textrm{himpunan penyelesaian} \end{aligned}}\\\hline \end{array} \end{array}

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