# [SOLVED] equation help

• Dec 18th 2007, 10:04 AM
gracey
[SOLVED] equation help
3x² + 4 = 0
any help would be excellent thanks
• Dec 18th 2007, 10:17 AM
bobak
two methods

if you are fimmilar with completing the sqaure

$x^2-5x = (x- \frac{5}{2})^2 - ( \frac{5}{2})^2$

it should be obvious that you will get a minimum when $x- \frac{5}{2} = 0$

can you finish it form there ?

for the second part, if your draw a reasonable sketch of the of the graph it should be obvious.
• Dec 18th 2007, 10:21 AM
gracey
thanks