Question

find with out actual multiplication (42) square​

Answer 1

Answer:

The square of 42 is 1764

Answer 2

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$(40 + 2)^{2} = {42}^{2} = = = > (a + b)^{2}--> {a}^{2}+{b}^{2}+2(a)(b) \\ (40)^{2} + {2}^{2} + 2(40)(2) \\ 1600 + 4 + 160 \\ 1764$