Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$${ 69 }^{ 2 } - { 72 }^{ 2 }$$

Answer

-423

Solution


Simplify  \({69}^{2}\)  to  \(4761\).
\[4761-{72}^{2}\]
Simplify  \({72}^{2}\)  to  \(5184\).
\[4761-5184\]
Simplify.
\[-423\]
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