-4 and 4
x = { +6, -6 }
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
x2≤64
If you meant x2 = 16 then take square root both sides which gives x = 4 but you need to see that -42 is also 16 so that is another solution. The two solutions are 4 and -4.
-4 and 4
do it yourself
x = { +6, -6 }
x2 + 49 = 0 ∴ x2 = -49 ∴ x = 7i
Using the quadratic formula, I found the solution set is x=2,x=-9
x2≤64
If x2 = 16 then this is not written as an inequality.An inequality tells us that one thing is not equal to another.The above is an equation, because it is telling us that one thing is equal to another.If x2 = 16 then x = 4 & -4.
If you meant x2 = 16 then take square root both sides which gives x = 4 but you need to see that -42 is also 16 so that is another solution. The two solutions are 4 and -4.
Equals anything... x is a variable. If that equation was set equal to zero then you could solve for x, but that is not what you have asked.
if x2 ≠ 16, then: {x | x ∈ ℜ, x ∉ (4, -4)}
(-4,6)
-4