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differentiate (1+2x^2)^(1/2)

This differentiation requires use of the chain rule. The first step is to differentiate the whole thing, treating the bracket as u, so u=1+2x 2 . Therefore we are differentiating u 1/2 . This means our first...
RS
Answered by Reuben S. • Maths tutor
11519 Views

Factorise this formula completely 2kx + 6ky + 4kz

2kx + 6ky + 4kz =2k (x + 3y + 2z)
SK
Answered by Samah K. • Maths tutor
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When a fifth of the class is absent, there are 24 pupils present. What is the total number of pupils in the class?

Since 1/5 of the class is absent, this must mean that 4/5 of the class is present. We are told that 24 pupils are present, so 4/5 of the class must equal 24 pupils. Now we need to find out how many pupils 1/...
AT
Answered by Arisera T. • Maths tutor
9371 Views

Solve algebraically 6a + b = 16 & 5a - 2b = 19

6a + b = 16 Equation 1 5a - 2b = 19 Equation 2 Scale up one equation so both equations have same coeffient of one variable ie 2 times Equ 1 12a + 2b = 32 5a - 2b = 19 Add variables of each equation, hence el...
EM
Answered by Euan M. • Maths tutor
3555 Views

Find the solutions to the quadratic equation x^2-9x+20=0

By factorising the expression, (x-5)(x-4)=0. This means that either (x-5)=0 or (x-4)=0. By solving these equations we can work out the solutions to be x=4,5.
CM
Answered by Chris M. • Maths tutor
3820 Views