Question

Simplifique as expressões
a)(x+2)^2 - x (x-3)
b) 2x+4a^2 - ( x +1/4 ^2)
c) (1/2 +y )^2 - y (y+1)

Answer 1

a)(x+2)^2 - x (x-3)

x^2 + 4x + 4 - x^2 + 3x ==> 7x + 4
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b) 2x+4a^2 - ( x +1/4)^2

2x+4a^2 - ( x^2 + 2/4x + 1/16) ==> 2x + 4a^2 - x^2 - 2/4x - 1/16

 4a^2 - x^2 - 2/4x  + 2x - 1/16 ==> 4a^2 - x^2 + 6/4x - 1/16 
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c) (1/2 +y )^2 - y (y+1) = 1/4 + y + y^2 - y^2 - y ==> 1/4