When does a(b+c) result as a positive value for ac?
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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When does a(b+c) result as a positive value for ac?
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Step 1
Note: If a>0 and b<0 then ab<0
If a>0 and b>0 then ab>0
If a<0 and b<0 then ab>0
Sum of two positive numbers is positive.
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