This is the process of completing the square.
Keep this equation in mind:

Basically, to make this a perfect square trinomial, you take half of b and square that value. This will make it so you can compress the left side of the equation into

depending on the sign in the middle of the original equation.
<span>Factors of 3969:
1,3,7,9,21,27,49,63,81,147,189,441,567,1323,3969
-1,-3,-7,-9,-21,-27,-49,-63,-81,-147,-189,-441,-567,-1323,-3969 is this what you mean
</span>
-8a-3b+6b-5a+9b= -13a-18b
-8a-5a=-13a
3b+6b+9b=18b
Hopes that helps
Step-by-step explanation:
2/3=0.66666666666
4/5=0.80000000000
10 rational numbers between them
0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79
I can't see the image clear enough!