Question

$(2\frac{1}{2}{)}^2-(1\frac{1}{2}{)}^2=$

• A. 3
• B. 4
• C. $$3\frac12$$
• D. $$4\frac12$$

Answer 1

Answer:

B. 4

$(2\frac{1}{2}{)}^2-(1\frac{1}{2}{)}^2$

$(\frac{5}{2}{)}^2-(\frac{3}{2}{)}^2$

$\frac{25}{4}-\frac{9}{4}$

$=\frac{25-9}{4}$

$\frac{16}{4}$

$=4$