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4.9 (36 reviews)
Intasar
£48
/h
1st lesson free!
4.9 (29 reviews)
Paolo
£30
/h
1st lesson free!
5 (16 reviews)
Jamie
£25
/h
1st lesson free!
5 (16 reviews)
Harinder
£15
/h
1st lesson free!
5 (17 reviews)
Matthew
£30
/h
1st lesson free!
4.9 (12 reviews)
Petar
£40
/h
1st lesson free!
5 (24 reviews)
Shane
£25
/h
1st lesson free!
4.9 (31 reviews)
Sehaj
£25
/h
1st lesson free!

=

## Solution of exercise 2

As a number squared is always positive.

S =

## Solution of exercise 3

The sign obtained coincides with the inequality, the solution is .

## Solution of exercise 8

The first factor is always positive.

## Solution of exercise 10

The second factor is always positive and different to 0.

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