[tex]c)e(x) = ( \sqrt{5} x + 4)( \sqrt{5}x + 4) - (2x + 5) {}^{2} + (7x - 1) {}^{2} = ( \sqrt{5} x + 4) {}^{2} - (4x {}^{2} + 20x + 25) + 49x {}^{2} - 14x + 1 = 5x {}^{2} + 8 \sqrt{5} x + 16 - 4x {}^{2} - 20x - 25 + 49x {}^{2} - 14x + 1 = 50x {}^{2} + 8 \sqrt{5} x - 8 - 34x[/tex]
