Question

$12.5^2=?$

• A. 144.25
• B. 150.25
• C. 156.25
• D. 137.25

Answer 1

Answer:

C. 156.25

$(a+b)^2=a^2+2ab+b^2$

$12.5^2=(12+0.5)^2$

$=12^2+2\times12\times0.5+0.5^2$

$=144+12+0.25$

$=156.25$