BOBOzA999999zD,X zCX  Z-jFLOM!`kxHHg\HH(dh  /t6zE,5@L  zCh _vDSETr)))&zCLzCPzCTzCDgzF\ `gzC\ 0 ' < Q e v  R    ! 4 ~   2 e    Q k n           )   zCHzFT\documentclass[b5paper,10pt]{jarticle} \usepackage{amsmath} \usepackage{amssymb} \usepackage{amsthm} \begin{document} \begin{math} 6x^2+49+30\\[0.5cm] =6\left[x^2+\displaystyle\genfrac{}{}{0.5pt}{}{49}{6}x+5\right]\\[0.5cm] =6\left[x^2+\displaystyle\genfrac{}{}{0.5pt}{}{49}{6}x +\left(\displaystyle\genfrac{}{}{0.5pt}{}{49}{12}\right)^2 -\left(\displaystyle\genfrac{}{}{0.5pt}{}{49}{12}\right)^2 +5\right]\\[0.5cm] =6\left[\left(x^2+\displaystyle\genfrac{}{}{0.5pt}{}{49}{12}\right)^2 -\left(\displaystyle\genfrac{}{}{0.5pt}{}{49}{12}\right)^2 +5\right]\\[0.5cm] =6\left[X^2-\displaystyle\genfrac{}{}{0.5pt}{}{1681}{144}\right]\\[0.5cm] =6\left(X-\displaystyle\genfrac{}{}{0.5pt}{}{41}{12}\right) \left(X+\displaystyle\genfrac{}{}{0.5pt}{}{41}{12}\right)\\[0.5cm] =6\left(x+\displaystyle\genfrac{}{}{0.5pt}{}{49}{12} -\displaystyle\genfrac{}{}{0.5pt}{}{41}{12}\right) \left(x+\displaystyle\genfrac{}{}{0.5pt}{}{49}{12} +\displaystyle\genfrac{}{}{0.5pt}{}{41}{12}\right)\\[0.5cm] =3\left(x+\displaystyle\genfrac{}{}{0.5pt}{}{2}{3}\right) 2\left(x+\displaystyle\genfrac{}{}{0.5pt}{}{15}{2}\right)\\[0.5cm] =(3x+2)(2x+15)\\\\[0.5cm] \\ K\\[0.5cm] 1)~~27x^2+6x-8\\ 2)~~24x^2-2x-15\\ 3)~~8x^2+2x-15\\ 4)~~12x^2-25x-7\\ 5)~~10x^2+23x-42\\ 6)~~27x^2-3x-14\\ 7)~~24x^2+46x+21\\ 8)~~8x^2-2x-21\\ \end{math} \end{document} ZNDSET2HzD0g6*DSET2HzD8gg6*DSUMHDNISTYLR JSTYLzAtzBzAxzAzAzAzB,zBtzB3   )   (    F HASHrO'B.  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