Question

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Answer 1

Respuesta:

5.

a = 2

b = 3

a² + b² = 2² + 3² = 4 + 9 = 13

-3a²b + 8ab² - b³ = -3(2²)(3) + 8(2)(3²) - 3³ = -9(4) + 16(9) - 27 = -36 + 144 - 27 = 144 - 63 = 81

-5a³ -6ab² + 8 = -5(2²) -6(2)(3²) + 8 = -5(4) -12(9) + 8 = -20 -108 + 8 = -128 + 8 = -120

3a²b - 2b³ = 3(2²)(3) - 2(3³) = 9(4) - 2(27) = 36 - 54 = -18

Ahora, a sumar todo:

13 + 81 + (-120) + (-18) = 94 + (-138) = -(138-94) = -44

Respuesta: e) Ninguno

6.

-(a + b) + [-3a + b - {-2a + b - (a - b)} + 2a]

= -a -b + [-3a + b - {-2a + b - a + b} + 2a]

= -a -b + [-3a + b - {-2a -a + b + b} + 2a]

= -a -b + [-3a + b - {-3a + 2b} + 2a]

= -a -b + [-3a + b + 3a - 2b + 2a]

= -a -b + [-3a +3a +2a -2b +b]

= -a -b + [2a -b]

= -a -b + 2a -b

= 2a - a - b - b

= a - 2b

Respuesta: b) a - 2b

Explicación paso a paso:

Espero te sirva