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Solve the equation x^2-9x+20=0

First, we need to factorise the equation on the left hand side, this can be done by finding two numbers that add together to make the 'b' coefficient (-9) and multiply to make the 'c' coefficient (20).

Answered by Joseph B. • Maths tutor

28768 Views

If f'(x)=3x(x - 1), find f(x)

Due to notation difficulties, S = integral sign. This is a straightforward integration question, firstly we expand the brackets:

f'(x)=3x^2 - 3x f(x)=S(3x^2 - 3x)dx f(x)=3/3x^3 - 3/2x^2 + C f(x)=x^...

Answered by Grace R. • Maths tutor

4753 Views

Discuss the implications of increased output on EOS and DOS within a firm.

As output increases it is a general rule that cost decreases, but why is this? Let's look at the principle of EOS and how they reduce costs. Starting with Technical EOS, here you have one fixed cost for t...

Answered by Howard C. • Business Studies tutor

1841 Views

Explain the formation of a waterfall

The is a layer of harder rock on top of soft rock. The softer rock underneath erodes more quickly, undercutting the hard rock. This leave the hard rock to over hang. Eventually the soft rock is undercut s...

Answered by Hannah S. • Geography tutor

3566 Views

what is a test cross used for and how do you know what genotypes to cross?

A test cross is used to discover the genotype of an individual by crossing two parents to see the phenoypic ratio of the offspring produced. A homozygous recessive individual (one with two recessive or sm...

Answered by Emily R. • Biology tutor

18263 Views