Объяснение:
1.
2(х-3)²+12х=2(х²-6х+9)+12х=
=2х²-12х+18+12х=2х²+18
2.
(2х-3)(3х+2)-13(х-1)=6х²+4х-9х-6-13х+13=
=6х²-18х+7
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Объяснение:
1.
2(х-3)²+12х=2(х²-6х+9)+12х=
=2х²-12х+18+12х=2х²+18
2.
(2х-3)(3х+2)-13(х-1)=6х²+4х-9х-6-13х+13=
=6х²-18х+7