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Write x² + 4x -16 = 0 in the form (x+a)² - b = 0. Solve the equation giving your answer in surd form as simply as possible.

x² + 4x -16 = 0 (x+2)² -20 = 0 We note that the coefficient of x² is 1 and the coefficient of x is 4. Therefore we say the that square is (x+2). This leaves us with an additional 4 from this ex...

Answered by Henry H. • Maths tutor

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Ammonia is made from nitrogen and hydrogen in a reversible reaction. Write a balanced symbol equation for this reaction, name the reaction and give one use for ammonia.

N₂ + 3H₂⇌ 2NH₃The Haber process, and ammonia is used in the production of many synthetic fertilizers.

Answered by Henry H. • Chemistry tutor

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Examine the view that 'Feminine Gospels' is solely concerned with female suffering

In ‘The Long Queen’, Duffy establishes the suffering caused by patriarchal oppression, but suggests that the resulting subversive nature of women is one of beauty and power. Duffy opens the poem (and the ...

Answered by • English tutor

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Explain how a catalyst works to increase the rate of reaction

A catalyst will provide an alternative route for the reaction with a lower activation energy by allowing reacting molecules to bind to their active sites. In addition, a catalyst will not be used up in th...

Answered by Abhishek B. • Chemistry tutor

1726 Views

How do I balance description and evaluation when answering an essay based question?

Firstly, the amount of description and evaluation expected of you will depend upon the wording of the question. Once you have considered what is expected of you, you can proceed confidently to answer the ...

Answered by Declan H. • Psychology tutor

1689 Views