Question

considerando a = -2 e b = +5 determine o valor das expressões
a) a + b =
b) a × b =
c) -(a - b) =
d)-(a + b) =
e)(a + b)^2 =​

Answer 1

a = - 2

b = + 5

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a) a + b

- 2 + 5 = 3

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b) a × b

(- 2) × 5 = - 10

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c) - (a - b)

- (- 2 - 5)

- (- 7) = 7

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d) - (a + b)

- (- 2 + 5)

- (3) = - 3

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e) (a + b)²

(- 2 + 5)²

(3)² = 3 × 3

= 9