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Describe the difference between a covalent bond and an ionic bond.

An ionic bond if formed from the transfer of electrons from the outer shell of atoms. The donor of the electrons becomes positively charged as it has more protons than electrons, and so is called a cation. T...
HT
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How to I factorise a quadratic equation?

I think the best way to show how to do this is with an example "Factorise 6x 2 + 7x - 3" Looking at that expression, we can't factorise it straight away, so we'll have to rewrite it in a way that a...
DB
Answered by Daisy B. • Maths tutor
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Express Cosx-3Sinx in form Rcos(x+a) and show that cosx-3sinx=4 has no solution MEI OCR June 2016 C4

Cosx-3sinx =R(CosxCosa-SinxSina) 1=Rcosa R^2=1^2+3^2 r=(10)^0.5=(approx)3.16 a=1.249 3.16Cos(x+1.249)=4 has no solution as 4<3.16 so as cos(theta) has maximum value of 1, there are no solutions
JP
Answered by Jakub P. • Maths tutor
5837 Views

How do you find the area of a semi circle with a radius of 7cm?

You should remember that a semi circle is the same as half a circle, therefore the area must be half as well! The formula for the area of a circle is pi r^2. If we use this, the area of our circle = pi x (7^...
CJ
Answered by Cindiya J. • Maths tutor
13884 Views

Find CO-Ordinates of intersection of 2x+3y=12 and y=7-3x

Picture of Answer available on request
JP
Answered by Jakub P. • Maths tutor
4998 Views