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If for the function`Phi(x)=lambdax^(2)+7x-4,` `phi` (5) = 97, find `lambda` .

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`Phi(x)=lambdax^(2)+7x-4,`
`Phi^(')(x)=2lambda x+7]`
`Phi^(')(5)=97`
`10 lambda+7=97`
`10 lambda=90`
`lambda=9`
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