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F(X)=2x^2 +1 find and simplify:: if f(a) =19 find a. Isn't a just 19??
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F(X)=2x^2 +1 find and simplify:: if f(a) =19 find a.
Isn't a just 19??

User Jim Rubenstein
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2a^2+1=19\\ 2a^2=18\\ a^2=9\\ a=-3 \vee a=3
User Underdog
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