The expression 16x^2-106x-105 can be written as (8x + a)(2x + b), where a and b are integers. What is a + 2b?
Question from AoPS. Please help!
I tried to do it and figured out that a+4b=-53 but...
yeah. anyways.
Question from AoPS. Please help!
I tried to do it and figured out that a+4b=-53 but...
yeah. anyways.
1 Answer
Jun 4, 2018
-23
Explanation:
If you factorise it (or you could use the formula) you get
This gives a=7 and b=-15
a+2b=7-30=-23