Question

$2.3^2=?$

• A. 4.6
• B. 2.3
• C. 6.9
• D. 5.29

Answer 1

Answer:

D. 5.29

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

$2.3=(2+0.3)^2$

$=2^2+2\times2\times0.3+0.3^2$

$=4+1.2+0.09$

$=5.29$