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Factorise x^2+6x-27

Label the three coefficients (each number, including an invisible 1 in from of the x 2 ) as a, b and c.Think of it in two parts: a multiplied by c, which is just -27 in this example.The second part is just t...
BG
Answered by Benjamin G. • Maths tutor
11133 Views

2x + y = 1, x^2 + y^2 = 1

1 : 2x + y = 1 y = 1 - 2x2 : x^2 + (1-2x)^2 = 1 x^2 + (1-2x)(1-2x) = 1 x^2 + 1 - 2x - 2x + 4x^2 = 1 5x^2 - 4x + 1 = 1 5x^2 - 4x = 0 x(5x - 4) = 0 x = 0, x = 4/5 y = 1, y = -3/5
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Answered by Josh T. • Maths tutor
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Prove that the square of an odd number is always 1 more than a multiple of 4.

Recap, what is 'squaring a number'? Multiplying a number by itself, for example, 3 x 3 = 9. The question hasn't given us a specific number, hence that value can be any number, it is said to be a 'variable'. ...
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Answered by Florence O. • Maths tutor
3974 Views

Who won the Cuban Missile Crisis?

Make a quick plan to ensure that your essay has a clear structure. In this essay question, it is asking who won the Cuban Missile Crisis so it is important to consider all the participants in this event, tha...
AB
Answered by Alice B. • History tutor
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How do I form the imperfect tense in Spanish?

The imperfect tense is used to describe an action in the past that took place over a period of time such as "I was going" or "It was sunny". It is one of the simpler Spanish verbs to conj...
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Answered by Alice B. • Spanish tutor
4020 Views