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What number multiplies to be 4 and adds to be -9

Guest Nov 29, 2018
 #1
avatar+3198 
+1

this makes no sense as written

Rom  Nov 29, 2018
edited by Rom  Nov 29, 2018
 #2
avatar+701 
+3

Technically, any number can be multiplied by something to equal 4 and added to something to be -9. There. Problem solved.

 

- PM

PartialMathematician  Nov 29, 2018
edited by PartialMathematician  Nov 29, 2018
 #3
avatar+27231 
+1

I suspect this is meant to be "What two numbers when multiplied equal 4 and when added equal -9?"

 

If so, from x*y = 4 and x+y = -9, we find the two numbers to be:  (√(65) - 9)/2  and (-√(65) - 9)/2.

Alan  Nov 29, 2018

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