## help_people one year ago Solve 3x2 + 18x + 15 = 0 by completing the square. 3(x + 3)2 = 6; x = −3 + square root 2, x = −3 − square root 2 3(x + 9)2 = 12; x = −11, x = −7 3(x + 3)2 = 12; x = −5, x = −1 3(x + 9)2 = 228; x = −9 + square root 76, x = −9 − square root 76

1. anonymous

divide by 3

2. anonymous

$x^2+6x+5=0$ $x^2+6x=-5$ add both sides $\left( \frac{ 6 }{ 2 } \right)^2 ~i.e.,9$ $x^2+6x+9=-5+9$ $\left( x+3 \right)^2=2^2$ $x+3=\pm2,x=?$

3. help_people

4?

4. anonymous

no

5. anonymous

x+3=2 x=?

6. help_people

-1

7. anonymous

correct and x+3=-2 x=?

8. help_people

-5

9. anonymous

correct these are two values of x

10. help_people

THANK YOUUUU :)

11. anonymous

yw