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Algebra Level 1

If x = 5 , y = 2 , z = 2 x=5,y=2,z=-2 , find ( x + y + z ) 2 (x+y+z)^2 .


The answer is 25.

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2 solutions

By substitution, we get

( 5 + 2 2 ) 2 = 5 2 = 25 (\large 5+2-2)^2=5^2=25

(5 + 2 - 2) = 5

5 2 = 25 5^2= 25

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