(x+5)²-28=7x+25
х² +10x + 25 - 28 = 7х+ 25
x² +10x - 28 = 7х
x² +10x - 28 -7x = 0
х² +3х - 28 = 0
х(x+7) -4(х+7) =0
(х+7)х(х - 4) =0
x +7 = 0
x - 4 = 0
x1=-7
x2=4
(x+5)²-28=7x+25
х² +10x + 25 - 28 = 7х+ 25
x² +10x - 28 = 7х
x² +10x - 28 -7x = 0
х² +3х - 28 = 0
х(x+7) -4(х+7) =0
(х+7)х(х - 4) =0
x +7 = 0
x - 4 = 0
x1=-7
x2=4