Question

for the function f(x)=x^2+2x-24
f(x)>(or eqaul) =0
i've got (-6,4]
is that right?

Answer 1

yes correct.
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Answer 2

can i write as (-intinite, -6)U[4,intinite)????

Answer 3

i think (-intinite, -6]U[4,intinite) is correct.....(-6,4] is wrong,to be sure put any number in this range,say 0,and u get negative ans...why u put ) after -6?-6 is included in the range,isn't it?

Answer 4

oh. ok. i got negative smller than -6. that's why.