Two more than four times a number.
2+4x=15

13/4

Step-by-step explanation:

Subtract 2 from both sides. Now we have 4x=13. Divide by 4. We have our x=13/4.

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as we don't know if g(x) is continue,

answer b

f(x)=2x²-8x+1=2(x²-4x+4)+1-8=2(x-2)²-7

vertex is (2,-7) ( a minimum since coefficient of x² is > 0)