# Math Help - name the restrictions for each expression

1. ## name the restrictions for each expression

all I can say is help lol if some one could please show me the work and answer I think I will be able to finish the rest of my problems like this thanks in advance
#1

x^2+5x-7
_________

2-x

#2

t^2+4t+4
_________

t^2-16

all I can say is help lol if some one could please show me the work and answer I think I will be able to finish the rest of my problems like this thanks in advance
#1

x^2+5x-7
_________

2-x

#2

t^2+4t+4
_________

t^2-16
Can the denominator of any expression be 0?

-Dan

all I can say is help lol if some one could please show me the work and answer I think I will be able to finish the rest of my problems like this thanks in advance
#1

x^2+5x-7
_________

2-x

#2

t^2+4t+4
_________

t^2-16
1.)

$\frac{x^2+5x-7}{2-x}$, $x \not= 2$

2.)

$\frac{t^2+4t+4}{t^2-16}$ $=$ $\frac{(t+2)^2}{(t+4)(t-4)}$, $t \not= \pm 4$

4. I do not htink they could be zero is the answer as simple as that zero?

5. how did u get the 2 and the +or- 4

As if you have $t = \pm 4$ then one bracket becomes zero hence when you times the other bracket, your whole denominator becomes zero which is not allowed.