# Question 4

• Jul 21st 2007, 07:18 PM
zbest
Question 4
The x values in decimal forms of 25(x+1)^2=16 are?
• Jul 21st 2007, 07:33 PM
Jhevon
Quote:

Originally Posted by zbest
The x values in decimal forms of 25(x+1)^2=16 are?

No big deal here

$25(x + 1)^2 = 16$

$\Rightarrow (x + 1)^2 = \frac {16}{25}$

$\Rightarrow x + 1 = \pm \sqrt { \frac {16}{25}}$

$\Rightarrow x = -1 \pm \sqrt { \frac {16}{25}}$

Just plug that into your calculator to get the decimal values
• Jul 25th 2007, 08:56 PM
curvature
Quote:

Originally Posted by Jhevon
No big deal here

$25(x + 1)^2 = 16$

$\Rightarrow (x + 1)^2 = \frac {16}{25}$

$\Rightarrow x + 1 = \pm \sqrt { \frac {16}{25}}$

$\Rightarrow x = -1 \pm \sqrt { \frac {16}{25}}$

Just plug that into your calculator to get the decimal values

No need to use a calculator since sqrt(16/25)=4/5=0.8