N241 n1
(x+2)^2-49=0
x^2+4x+4-49=0
x2 + 4x - 45 = 0
D = b2 - 4ac
D = 16 + 180 = 196 = 14^2
x1,2 = -b ± √D/2a
x1 = -4 + 14/2= 10/2= 5
x2 = -4 - 14/2 = - 18/2 = -9
Ответ: x1 = 5; x2 = -9
N2
36x^2+108x+81-25=0
36x^2+108+56=0 l :4
9x^2+27x+14=0
Корень Д = 15
x1=7\3
x2=2\3