1.

\begin{array} { l } { \text { Evaluate the following } } \\ { ( 152 ) ^ { 2 } - ( 148 ) ^ { 2 } } \end{array}

Answer»

a^2-b^2=(a+b)(a-b)hence (152)^2-(148)^2=(152+148)(152-148)=4(300)=1200

152×152 _ 148×148

= 23104 _ 21904

= 1200 ans



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