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Let a and b be positive real numbers. If x^2 + y^2<=1 then what is the largest that ax+by can get?

By the Cauchy-Schwartz inequality, we have (x² + y²)(a²+b²) >= (ax+by)².
This can be transformed into (ax+by)² <= (x²

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How can I analyse poetic form to help me in an essay?

Ostensibly you have to analyse how the form interacts with the poem's thematic content and how that affects your arguments: does the form prove/disprove, agree/disagree with any of your major points, or i...

Answered by Basil L. • English Literature tutor

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What are enzymes and how do they work?

Enzymes are what are called 'biological catalysts;' that means they speed up how fast a reaction takes but they are unchanged by the reaction themselves. They work by lowering the activation energy needed...

Answered by Tom D. • Biology tutor

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Describe how Hitler reduced unemployment in Germany.

The best way to answer a 'describe' question is to give three factors and explain them briefly. These questions are worth 5 marks each. So, three factors you could describe are:Use of the National Labour ...

Answered by Emma H. • History tutor

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chance following sentences in "passe compose"

Elle achète une jupe.Elle a acheté une jupe. Il me donne un stylo.Il m'a donné un stylo.Les garcons mangent du chocolat.Les garcons ont mangé du chocolat.

Answered by Eva V. • French tutor

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