[tex]5\sqrt{x^{2}+8x+16}+\sqrt{25x^{2} -10x+1} = 5\sqrt{(x+4)^{2} } +\sqrt{(5x-1)^{2} } = 5|x+4| + |5x-1| = |5x+20| + |5x-1| = 5x + 20 -(5x-1) = 5x+20-5x+1 = 21[/tex]
