Question

If y>0, which of these values of x is NOT in the domain of this equation? y=x2+7x

Answer 1

`\boxed{\sf \ \ \ [-7,0] \ \ \ }`

Explanation:

Hello

`y=x^2+7x=x(x+7) >0\\<=> x>0 \ and \ x+7 >0 \ \ or \ \ x<0 \ and \ x+7<0\\<=> x>0 \ \ or \ \ x<-7\\`

So values of x which is not in this domain is

`-7\leq x\leq 0`

which is [-7,0]

hope this helps