deannaellis deannaellis

11-02-2018
Mathematics

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The square of a number plus 3 times the number is equal to four . What is the number.

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thequeen4 thequeen4

11-02-2018

x^2+3x=4
x^2+3x-4=0
From here you probably know how to solve but I'm going to solve it.
x^2-4x+x-4=0
x(x-4)+1(x-4)=0
(x+1)(x-4)=0
x=-1,4

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