Question

Resolva

a) x ( x -2) + 3x ( 2x + 5)
b) 8 (x -2) +7 . (x-5) -9x
c) 3 ( 2x -1) -2 (4-x)

Answer 1

a) x( x -2) + 3x(2x + 5) =               faça as distributivas:
x² - 2x + 6x² + 15x = 
7x² + 13x
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b) 8(x -2) +7.(x-5) -9x = 
8x² - 16 + 7x - 35 - 9x = 
8x² - 2x - 51
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c) 3( 2x -1) -2(4-x) =
6x - 3 - 8 + 2x = 
8x - 11

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