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Find the integral of ln x

x*ln|x| - x

SJ
Answered by Suleiman J. Maths tutor
3403 Views

What is (5+3i)*(3+5i)

The idea here is to explain to the student that i^2=-1, and to expand and simplify the brackets in question just like they would with simple algebra. Therefore:
(5+3i)*(3+5i)=15+25i+9i+15i^2=15+34i-1...

SK
Answered by Sebastian K. Maths tutor
3370 Views

Expand the following quadratic (x+3)(2x-2)

When expanding quadratics, the ‘smiley face’ method is the easiest one to follow. Do each term individually. The lines you draw between the terms will resemble a smiley face. Ensure that there are 2 lines...

JL
Answered by Jordan L. Maths tutor
3578 Views

Solve x^2 -4x=12

1:Firstly, put all the terms on the Left Hand Side, leaving only 0 on the right hand side2: Factorise the equation a) think about what multiples can be used to calculate -12 1*-12=-12 and -112=-12 2

EM
Answered by Elisabeth M. Maths tutor
2973 Views

A football pitch has a length of the xm. Its width is 25m shorter than the length. The area of the pitch is 2200m2. Show that x2 - 25x - 2200 =0 and work out the length of the football pitch.

Draw rectangle with length x and width (x - 25)show that area = length * width = x(x -25) = x2 - 25xx2 - 25x = 2200x2 - 25x -2200 = 0This cannot be factorised therefore must use quadratic equation: x = [-...

SO
Answered by Sophie O. Maths tutor
3513 Views

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