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My23
@My23
January 2020
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Calcule o valor das expressões :
a) (3x + 2) (3x - 2) + (X + 2)ao quadrado
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PauloBarros
A)
= (3x + 2) (3x - 2) + (x + 2)²
= 3x.3x - 2.3x + 2.3x + 2.(-2) + x² + 2.2x + 2²
= 9x²
- 6x + 6x
- 4 + x² + 4x + 4
= 9x²
- 4
+ x² + 4x
+ 4
= 9x² + x² + 4x
= 10x² + 4x
R.: 10x² + 4x
1 votes
Thanks 2
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= (3x + 2) (3x - 2) + (x + 2)²
= 3x.3x - 2.3x + 2.3x + 2.(-2) + x² + 2.2x + 2²
= 9x² - 6x + 6x - 4 + x² + 4x + 4
= 9x² - 4 + x² + 4x + 4
= 9x² + x² + 4x
= 10x² + 4x
R.: 10x² + 4x