Объяснение:
3.
(4х-6)^2+(2х-6)(2х+6)+102х=
16х^2-48х+36+4х^2-36+102х=
=20х^2+54х
Х= - 5
20×(-5)^2+54×(-5)=20×25-270=
=500-270=230
4.
(3а^2+4в^2)^3=
=(3а^2)^3+3×(3а^2)^2×4в^2+3×3а^2×(4в^2)^2+
+(4в^2)^3=27а^6+108а^4в^2+144а^2в^4+
+64в^6
Объяснение:
3.
(4х-6)^2+(2х-6)(2х+6)+102х=
16х^2-48х+36+4х^2-36+102х=
=20х^2+54х
Х= - 5
20×(-5)^2+54×(-5)=20×25-270=
=500-270=230
4.
(3а^2+4в^2)^3=
=(3а^2)^3+3×(3а^2)^2×4в^2+3×3а^2×(4в^2)^2+
+(4в^2)^3=27а^6+108а^4в^2+144а^2в^4+
+64в^6