Answer :
Hello,
++++++++++++++++++++++++++
3x²-12x+7=3(x²-2*2x+4)+7-12
=3(x-2)²-5
Vertex is (3,-5)
++++++++++++++++++++++++
++++++++++++++++++++++++++
3x²-12x+7=3(x²-2*2x+4)+7-12
=3(x-2)²-5
Vertex is (3,-5)
++++++++++++++++++++++++