EDGE Math 8

Solve for the LCM of each set of polynomials. Choose the correct answer.

1.	$16 x^{3} and 36 x^{4}$

4 x^{3}

144 x^{4}

576 x^{7}

none of the choices

Answer: $144 x^{4}$

2.	$x + 5 and x^{2} - 25$

(x + 5)

(x + 5) (x - 5)

(x + 5) (x^{2} - 25)

none of the choices

Answer: $(x + 5) (x - 5)$

3.	$x^{2} - 1 and 8 x^{2} - 8$

8 (x + 1) (x - 1)

x^{2} - 1

8 (x - 1)

none of the choices

Answer: $8 (x + 1) (x - 1)$

4.	$3 (x + 7), 6 x (x + 7), and x + 7$

x + 7

6 x (x + 7)

18 x (x + 7)

none of the choices

Answer: $6 x (x + 7)$

5.	$(x + 4) (x - 1), {(x - 1)}^{2}, and 2 x + 8$

2 (x + 4) {(x - 1)}^{2}

2 {(x + 4)}^{2} {(x - 1)}^{2}

(x + 4) {(x - 1)}^{2}

none of the choices

Answer: $2 (x + 4) {(x - 1)}^{2}$

/ 5