Math

MJFan101 | 18:09 Thu 20th Oct 2011 | ChatterBank

10 Answers

Which two numbers add to get -20 and multiply to get -300?

Just wanted to say hello

well i finally capitulated ....

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ladyalex

10 and -30 ?

MJFan101

Question Author

Thank You So Much ladyalex :D

bibblebub

If you use simple algebra to solve this type of question then you would be less reliant on a site like this in future:-

x+y = -20=> y = -20 - x = -(20+x)

xy = -x(20+x) = -300 => x^2 + 20x = 300 => x^2 + 20x - 300 = 0 => (x-10)(x+30) = 0

therefore EITHER x = 10, y = -30 OR x = -30, y = 10

i.e. the two numbers are 10 and -30