Hi everyone, first post here
i'd appreciate it if anyone could help me with this question.
If (x-2A)(2x+1)=2x^{2}-Bx+10, then A • B =
thanks a lot
if this is in the wrong subforum sorry, its precalc homework so i put it here
Hey Hell0.
Hint: Try expanding both sides and multiply both sides by A so that you can match up the AB term and use the rest of the variables to solve for A,B (remember that in a quadratic, you have fx^2 + gx + c with three constants f,g,c).
Hi. this is what i tried
x - 4Ax = -Bx
and
-2A = 10
found a:
A = -5
then plugged it in:
x - 4(-5)x = -Bx
x + 20x = -Bx
pulled out the x because they all have it:
x + 20x = -Bx
1 + 20 = -B
-B = 21
B = -21
-21 * -5 = 105
The answer is 105?
hey thanks everyone. can you try to help me with this one? Pre-calc question? its the only blank question i have left. id really appreciate it