х(х-4)+х-4=0
(х-4)(х+1)=0
х-4 =0 х+1=0
х=4 х=-1
t(t+7)-4t -28=0
t(t+7)-4(t+7)=0
(t+7)×(t-4)=0
t+7=0 t-4=0
t=-7 t=4
х(х-4)+х-4=0
(х-4)(х+1)=0
х-4 =0 х+1=0
х=4 х=-1
t(t+7)-4t -28=0
t(t+7)-4(t+7)=0
(t+7)×(t-4)=0
t+7=0 t-4=0
t=-7 t=4