Answer:
2 or - 3
Step-by-step explanation:
Here, s represents the unknown number,
Since, square of s = [tex]s^2[/tex]
So, the square of s plus s = [tex]s^2+s[/tex]
According to the question,
[tex]s^2+s=6[/tex]
[tex]s^2+s-6=0[/tex]
By middle term splitting,
[tex]s^2+3s-2s-6=0[/tex]
[tex]s(s+3)-2(s+3)=0[/tex]
[tex](s-2)(s+3)=0[/tex]
[tex]\implies s=2\text{ or }-3[/tex]
Hence, the number would be 2 or -3.