Posted by Nik on Friday, September 16, 2011 at 12:49am.
look at 2
x^2-2x-4=ax^2-bx-18
4-4-4=4a-2b-18
2a-b=-18 check that.
at x=3
ax^2-bx-18=10x-a+b
9a-3b-18=30-a+b
10a-4b=48
Now you have two equations, two unknowns, solve.
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