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54.Find the number of solutions of the equation<br />
by using the discriminant.<br />
a. There is one solution.<br />
b. Cannot determine the number of solutions. The<br />
discriminant can only be used for a quadratic<br />
equation, and<br />
is not a quadratic<br />
equation.<br />
c. There are no real solutions.<br />
d. There are two solutions.<br />
55. Find the domain of the square-root function<br />
a. –8<br />
b. − 9 8<br />
c. −1<br />
d. –8<br />
.<br />
56.Simplify .<br />
a. c.<br />
b. d.<br />
57.Which graph represents a function<br />
a.<br />
y<br />
c.<br />
y<br />
5<br />
5<br />
4<br />
4<br />
3<br />
3<br />
2<br />
2<br />
1<br />
1<br />
–5 –4 –3 –2 –1<br />
–1<br />
1 2 3 4 5 x<br />
–2<br />
–3<br />
–4<br />
–5<br />
–5 –4 –3 –2 –1<br />
–1<br />
1 2 3 4 5 x<br />
–2<br />
–3<br />
–4<br />
–5<br />
b.<br />
y<br />
d.<br />
y<br />
5<br />
5<br />
4<br />
4<br />
3<br />
3<br />
2<br />
2<br />
1<br />
1<br />
–5 –4 –3 –2 –1<br />
–1<br />
1 2 3 4 5 x<br />
–2<br />
–3<br />
–4<br />
–5<br />
–5 –4 –3 –2 –1<br />
–1<br />
1 2 3 4 5 x<br />
–2<br />
–3<br />
–4<br />
–5
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