Question

Calcule:
a) (-2x)•(+3x)
b) (+5x)•(+4x)
c) (-n)•(+6n)
d) (-6x²)•(+3x²)
e) (-5)•(+15x²y)
f) (-2y)•(5y)
g) (+4x²)•(+5x³)
h) (-2x)•(-3y)
i) (+3x)•(-5y)
j) (-3xy)•(-2x)
k) (2xb)•(4x)
L) (-xy)•(-xy)•(-xy)

Obs: Me ajudem eu preciso muito... É para nota!!!!

Answer 1

a) (-2x) . (+3x) = - 6x²


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b) (+5x) • (+4x) = 20x²

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c) (-n) • (+6n) = - 6n²

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d) (-6x²) • (+3x²) = - 18x^4


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e) (-5) • (+15x²y) = - 75x²y

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f) (-2y) • (5y) = - 10y²

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g) (+4x²) • (+5x³) = 20x^5

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h) (-2x) • (-3y) = + 6xy

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i) (+3x) • (-5y) = - 15xy

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j) (-3xy) • (-2x) = + 6x²y

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k) (2xb) • (4x) = 8x²b

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l) (-xy) • (-xy) • (-xy) = - x^3y^3

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Regra de Sinais:

+ + = +
- - = +
+ - = -
- + = -

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