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  3. 419 let fx ax2 bx c be...

Question: 419 let fx ax2 bx c be...

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4-19. Let f(x) := ax2 + bx + c be a quadratic function defined on R. Prove that if a > 0 then f is decreasing on(m-5)andincreasingon( 00) -00,--) and increasing on --, 0 . State and prove a similar result for a <0.
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