Question

5x²+x=0 find the zero.
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Answer 1

5x²+x=0

x(5x+1)=0

x=0 or 5x+1=0

x=0 or 5x=-1

x=0 or x=-1/5

Answer 2

5x^2-x-4=0

5x^2-5x+4x-4=0

5x(x-1)+4(x-1)=0

(5x+4)(x-1)=0

x=-4/5,1