Jana1517
08.12.2020 •
Mathematics
How do you multiply negative and positive rational numbers.
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Ответ:
2018
Step-by-step explanation:
By grouping the first, last and two middle terms, we get (
+5x+4)(
+5x+6) + 2019. This can then be simplified to (
+5x+2)^2 - 1 + 2019 Noting that squares are nonnegative, and verifying that 
+ 5x + 5 = 0 for some real x, the answer is 2018.