Find a, b, if f(x) = ax^2 +b, f(1)=9, f'(1) = 8.
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f(x)=ax^2+b
f(1)=a+b
=>a+b=9
f'(x)=2ax+b
f'(1)=2a+b
=>2a+b=8
a=-1 & b=10.
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