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

Question

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

anonymous · Answer

hi welcome to openstudy!

first thing you have to do is turn the equation $ax^2+bx+c=0$ into $a(x+d)^2+e$

do you know how to do it?

anonymous · Answer

thats the only thing i am stuck on otherwise i know how to solve it