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Maths
A Level

Differentiate y=x^2 from first principles

y=x2dy/dx= Limh-->0( ((x+h)2-x2) / (x+h-x) )dy/dx= Limh-->0( (x2 + 2hx + h2 - x2) / h )dy/dx= Limh-->0...

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Solve 4log₂(2)+log₂(x)=3

First, we should look at the laws of logarithms.logax+logay=logaxylogax-logay=loga(x/y)klogax=logaxkWe ca...

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Differentiate y=x^x with respect to x.

y=x^x, taking natural log of both sides
ln(y)=ln(x^x), using laws of logs
ln(y)=xln(x), using product rule and implicit differentiation
dy/dx 1/y=ln(x)+1
dy/dx=(ln(x)+1)y
dy/dx=(l...

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Show that x^2 - 8x +17 <0 for all real values of x

consider the discriminant b2-4ac 82-4x1x17 64-68=-4 discriminant is below 0, there are no real roots therefore x2 - 8x +17 <0

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Calculate the first derivative of f( x)= 3x^3+2x^2-5

f’(x)= 9x^3+4x

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