Question

Compute square of $5.75$

• A. 32.0625
• B. 33.625
• C. 33.0625
• D. 32.625

Answer 1

The correct option is C

33.0625

$(5.75{)}^2$ can be written as

$(6-0.25{)}^2$

$=(6{)}^2+(0.25{)}^2-2\times 6\times 0.25\left[\right(x-y{)}^2=x^2+y^2-2xy]$

$=36+0.0625-3$

$=33.0625$