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Expand the following : (2x+3)(x-1)

We multiply the 2x in the first bracket by everything in the second bracket to give: 2x 2 -2xWe then multiply the 3 in the first bracket by everything in the second bracket to give: 3x-3Putting 2x 2 -2x and ...
SS
Answered by Samuel S. • Maths tutor
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Describe and explain how the typical mammalian eye provides a detailed colour image of close-up objects in high light intensities.

I would firstly begin with looking at the key words in the question such as "describe" and "explain": whilst trying to focus on those words during the entirety of the answer. This questio...
LG
Answered by Lucy G. • Biology tutor
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In a titration, 45.0 cm^(3) of 0.100 mol dm^(-3) sodium hydroxide solution is exactly neutralised by 40.0 cm^(3) of a dilute hydrochloric acid solution. Calculate the concentration of the hydrochloric acid solution in mol dm^(-3).

First of all, summarise everything that you know in a table or in brief notes:NaOH, 45 cm^(3), 0.1 mol dm^(-3)HCl, 40 cm^(3)The first thing that you need to do is to find the number of moles of NaOH. This is...
LJ
Answered by Lauren J. • Chemistry tutor
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Explain the differences between neuronal and hormonal communication and give an example of each.

Neuronal signals are often transmitted over a relatively short distance and over a short period of time. Due to pathways of neurons these signals can be incredibly specific, coming from one stimulus and bein...
PD
Answered by Peter D. • Biology tutor
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How to complete the square to solve quadratic equations?

Equation: x 2 +4x-5=0 (This is in the form ax 2 +2bx+c=0)First divide 2b by 2 (4/2=2)Then put this into (x+b) 2 -(b) 2 +c=0This gives: (x+2) 2 -(2) 2 + -5=0 (remembering +and- makes a -)Simplify to: (x+2) 2 ...
GJ
Answered by George J. • Maths tutor
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