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

Question

asked Apr 4, 2019 228k views

1 Answer

Calvin Froedge · Answer 1 · 2019-04-10T13:34:02+0000

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