3x(x-3)-x+3=0

=>3x(x-3)-(x-3)=0

=>(x-3)(3x-1)=0

=>\(\left[{}\begin{matrix}x-3=0\\3x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=3\\x=\dfrac{1}{3}\end{matrix}\right.\)

\(x^2-12x-36=0\)

=>\(x^2-12x+36-72=0\)

=>\(\left(x-6\right)^2=72\)

=>\(\left[{}\begin{matrix}x-6=6\sqrt{2}\\x-6=-6\sqrt{2}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=6\sqrt{2}+6\\x=-6\sqrt{2}+6\end{matrix}\right.\)

\(x^2+3x=0\)

=>x(x+3)=0

=>\(\left[{}\begin{matrix}x=0\\x+3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-3\end{matrix}\right.\)

1 My sister is _older than____ (old) me

2 Cars are _faster than____ (fast) bicycles

3 0/10 is_worse than____ (bad) 1/10

4 The River Nile is __longer than___  (long) the River Thames

5 Egypt is _hotter than____  (hot) Scotland

6 he cinema is __more expensive than___  (expensive) the swimming pool

\(3\left(x-5\right)+4\left(x+1\right)=6\left(x-4\right)\)

\(\Leftrightarrow3x-15+4x+4=6x-24\Leftrightarrow x=-13\)

1  less

2 near - father

3 slower

4 biggest

5 richer 

6 longest

7 the worst

8 most beautifully

9 small -larger

10 better 

11 more difficult

12 the nicest 

13 more powerfu

14 hottest 

15 most intelligent

1 => Your house is smaller than my house.

2 => The red car is more expensive than the black car

3 =>That film is not so interesting as this one

4 => My grandmother is the oldest person in my family

5 => Tam is the tallest student in my class

6 => My mother can cook better than I

7 => Jack can play tennis better than him

6 => You spent more money than I

9 => This book is not as cheap as I think

10 => No one in in his class is taller than him

1. My father is the tallest person in my family

2. She is the best guitarist in her class 

3.mount everest is the highest mountain in the world

4.He is intelligent in his family

5.Today is the hottest day of the year

6.This book is much cheaper than that one

7.No book on the bookshelf is as interesting as this book

8.This exercise is more difficult than the book