Question

3a²x² + 8abx + 4b² = 0

Answer 1

3a²x² + 8abx + 4b² = 0
⇒ 3a²x² + 6abx + 2abx + 4b² = 0
⇒  3ax(ax + 2b) + 2b(ax + 2b) = 0
⇒  (3ax + 2b) (ax + 2b) = 0
⇒  x = `-(2b)/(3a) or - (2b)/a`.