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How to solve Simultaneous Linear Equations, e.g. (4x + 5y = 17) and (3x + 2y = 4)

Explain how linear simultaneous equations with two variables ("unknowns") differ from single linear equations with two variables. Explain that a single linear equations have multiple, and indeed...

Answered by Henry B. • Maths tutor

3635 Views

Express (7+ √5)/(3+√5) in the form a + b √5, where a and b are integers.

(7+ √5)/(3+√5)Here, the denominator is not rational - (numbers like 2 and 3 are rational). A number with an irrational denominator isn't incorrect, it just isn't in the simplest form it can be in.To ratio...

Answered by Oscar G. • Further Mathematics tutor

17103 Views

A psychologist interviewed Zina and Amanda 5 months after witnessing a car crash to see if they could remember the same level of detail about the incident. Explain one ethical issue the psychologist must consider before interviewing Zina and Amanda.

The psychologist must consider Zina and Amanda's psychological wellbeing after witnessing the incident. Witnessing a car crash is a stressful ordeal; by recalling details of the incident Zina and Amanda c...

Answered by Hannah S. • Psychology tutor

2719 Views

f (x) = (x^2 + 4)(x^2 + 8x + 25). Find the roots of f (x) = 0

firstly, x²+ 4 = 0 x² = -4 x = 2i x = -2iSecondly, x² + 8x + 25 = 0 using the quadratic formulae: x = (-b +- sqrt(b² - 4ac))/2a x = (-8+-sqrt(64-100))/2 x = -8...

Answered by Laura S. • Maths tutor

4990 Views

How do you formulate the past tense (passé composé) in French?

The passé compose is put together using this simple formula:
Subject + Etre or Avoir conjugated in the present tense + past participle
The subject is either je, tu, il/elle/on...

Answered by Lily P. • French tutor

1954 Views