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Find the values of x given the equation (4x^2)-3x+1=2 using the quadratic formula.

4x 2 -3x+1=2The first step is to rearrange the equation, equating it to zero: 4x 2 -3x+1-2=0 which gives 4x 2 -3x-1=0. Next we apply the quadratic formula: x=(-b +/- sqrt(b 2 -4ac))/2a where a=4, b=-3 and c=...
SM
Answered by Shahnaan M. • Maths tutor
4122 Views

25cm3 NaOH was titrated with 0.05mol dm-3 HCl. 21.5m3 of HCl neutralised 25cm3 of NaOH. What is the concentration of NaOH in mol dm-3?

NaOH + HCl --> NaCl + H 2 O 1 : 1 : 1 moles (mol) = concentration (mol dm -3 ) x volume (dm 3 ) n(HCl) = 0.05 (mol dm -3 ) x 21.5/1000 (dm 3 ) = 0.001075 moles (1.075 x 10 -3 ) Using 1:1 molar ratio: n(Na...
BA
Answered by Britta A. • Chemistry tutor
6076 Views

When should I use "tu" and when should I use "vous"?

Unlike in English, there are two ways of saying " you " in French.Most of the time, when talking to someone, you will use " tu ". This is normally used when talking to friends, family or ...
JB
Answered by James B. • French tutor
2318 Views

How to analyse a poem?

When analysing a poem, I find that using the method ‘SMILE’ is very helpful. SMILE stands for:S - StructureM - MeaningI - ImageryL - LanguageE - Effect When looking at a poem, you should always try to find a...
GV
4170 Views

Expand (t+5)(t-2)

FOIL stands for First,Outer,Inner and Last. This is the order of multiplying the terms from each set of brackets.First terms give: t x t=t 2 Outer terms give: t x -2=-2tInner terms give: 5 x t=5tLast terms g...
OS
Answered by Ollie S. • Maths tutor
4875 Views