smallandrewserr smallandrewserr

09-05-2019
Mathematics

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which expression or expressions have thw same value a as 12. 2

which expression or expressions have thw same value a as 12 2 class=

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sqdancefan sqdancefan

09-05-2019

Answer:

B, C

Step-by-step explanation:

The values of the expressions are ...

A:

20^2 -18^2 = (20 -18)(20 +18) = 2·38 = 4·19 ≠ 12^2 = 4·36

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B:

8(4^2) +2^4 = 8(4^2) +4^2 = (8+1)·4^2 = (3·4)^2 = 12^2

__

C:

15^2 -3^4 = 15^2 -9^2 = (15 -9)(15 +9) = 6·24 = 6·2·12 = 12^2

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