Question

x+y= -47and xy=-378 find x=?

Answer 1

x=-54 or x= 7 I think this s right

Answer 2

hi all
x+y=-47 and xy = -378
x=( -47-y) (1)

xy=-378
subtituting x value
(-47-y)y=-378
-47y - y^2=-378
y^2+47y+378=0
product=378
sum=47
no.s=7,54
y^2-7y+54y-378=0
y (y-7)+54 (y-7)=0
y-7 and y+54 are factors
if y=7 and y=-54,
x=-54 and x=7

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