SOLUTION: I need help trying to solve this problem. Thank you in advance, for helping me out. I really appreciate your time and efforts. Have a terrific day :) Here is the question? Choose t

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: I need help trying to solve this problem. Thank you in advance, for helping me out. I really appreciate your time and efforts. Have a terrific day :) Here is the question? Choose t      Log On


   

Question 915744: I need help trying to solve this problem. Thank you in advance, for helping me out. I really appreciate your time and efforts. Have a terrific day :) Here is the question? Choose the correct method to factor each of the following:
-r^2 + 14 - 45
Answer by josgarithmetic(39838) About Me  (Show Source):
You can put this solution on YOUR website!
Try to look for two binomial factors. First, factorize -1 to make the task easier.

Next, can you find a pair of numbers whose sum is 14 (did you forget to include factor of r? ) and whose product is 45.

-1%28r%5E2-14r%2B45%29

3*15=45
5*9=45
Anything else?
No.


The question you really wanted was, what method needed to factor m%5E2%2B3m-20.
Not factorable. The method is the same, just that no need to factor any -1. What two integers have product of -20 and sum of 3? What are they? They MUST be integers.

Let's check what we can find.
Factorization of 20, ignoring sign:
1*20;
2*10;
4*5.
No others.
Any sum or difference to give positive 3?
-
-
NO.
Not factorable. PRIME.