Question

3а(а+2)=(а+3) в квадрате

Answer 1

3a^2 + 6a = a^2 + 6a + 9
3a^2 = a^2  +9
2a^2 - 9 = 0 
2a^2 = 9 
a^2 = 9/2

a1 = - 3/√2 
a2 = 3/√2