(a+6)(3a−4)+2(12−a
2
+
6a)+1=
=3a
+14a−24+24−2a
+12a+1=
=a
+26a+1
=(a+1)
(a+1)
+2a+1
P.S. (a+6)(3a−4)+2(12−a
−
−12a+1=
+2a+1=(a+1)
(a+6)(3a−4)+2(12−a
2
+
6a)+1=
=3a
2
+14a−24+24−2a
2
+12a+1=
=a
2
+26a+1
=(a+1)
2
(a+1)
2
=a
2
+2a+1
P.S. (a+6)(3a−4)+2(12−a
2
−
6a)+1=
=3a
2
+14a−24+24−2a
2
−12a+1=
=a
2
+2a+1=(a+1)
2