Question

1.4x+2=3.96
$1.4x2 + 2 = 3.96$

Answer 1

$1.4x^2 + 2 = 3.96\\\\ or \ \frac{7}{5} x^2 +2 = \frac{99}{25} ......( converting \ to \ fractions) \\\\ 35x^2 + 50 = 99 ...............( Multiplying \ both \ sides \ by \ the \ LCM \ 25) \\\\ 35x^2 = 99 - 50 \\\\ 35x^2 = 49 \\\\ x^2 = \frac{49}{35} \\\\ x = \sqrt{ \frac{49}{35}} \\\\ x = \frac{7}{\sqrt{35}} \ or \ - \frac{7}{\sqrt{35}}$

See the rationalisation steps in the image to get the further proceedings of the answer.

Answer 2

hope this helps you.....