Question

Simplifique as expressões:

a) 7x²+2.(x²-1) =
b) 10 - 4.(x-3) +5 =
c) -9. (2x-1) + 15x =
d) 3 . (x-2) + x² - x. (2- x) =
e) (2x + 1) - 3 . (5 - 2x) =

Answer 1

a) 7x²+2.(x²-1) =
    7x² +2x² -2 =
    9x² -2

b) 10 - 4.(x-3) +5 =
     10 -4x +12 +5 =
      -4x +10 +12 +5 =
      -4x +27

c) -9. (2x-1) + 15x =
    -18x +9 +15x =
    -18x +15x +9 =
    -3x +9

d) 3 .(x-2) + x² - x. (2- x) =
    3x - 6 +x² -4x +x² =
    x² +x² +3x -4x -6 =
    2x² -x -6

e) (2x + 1) - 3 . (5 - 2x) =
    (6x -3) . (5 - 2x) =
    6x.5 + 6x.-2x -3.5 -3.-2x =
    30x   -12x²     -15  +6x =
    -12x² -30x +6x -15 =
    -12x² -24x -15    

Answer 2

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Espero ter ajudado!!