Question

Спасайте народ (2х+1)^2-3(x-5)^2=(x+3)(x-3)

Answer 1

(2х+1)²-3(x-5)²=(x+3)(x-3)
4х²+4х+1-3(х²-10х+25)=х²-9
4х²+4х+1-3х²+30х-75-х²+9=0
34х-65=0
34х=65
х=65/34