Answer:
43 = 40 + 3 So, \[{{43}^{2}}={{\left( 40+3 \right)}^{2~}}~~~\] = (40 + 3) (40 + 3) = 40(40 + 3) + 3(40 + 3) \[=40\times 40+40\times 3+3\times 40+3\times 3\] = 1600 +240+9 =1849 So, \[{{43}^{2}}=\text{ }1849~\]
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