Question

Va rog sa ma ajutati ​

Answer 1

Explicație pas cu pas:

1. =-x

2. =15x

3. =2x-3

4. =x²-9x+8;

$delta = {b}^{2} - 4ac$

=81-32=49

$\sqrt{49} = 7$

x1, x2=

$- b + - \sqrt{delta} \div 2a$

x1=(9+7)/2=8

x2=(9-7)/2=1

=> x²-9x+8= (x-1)(x-8)

5. rationalizam cu:

$\sqrt{6 } + 2$

=>(5rad6+10)/10 => rad6/2 + 1