Question

65*) simplifique as expressões

a) (×+4)(×-3)+2

b) (×+3)(×+4)-2 (×+1)

c) 3×(×-1)+(×+2)(×+5)

Answer 1

( x + 4)(x - 3) + 2 =
x² - 3x + 4x - 12 + 2 =
x² + x - 10

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(x + 3)(x + 4) - 2(x + 1) =
x² + 4x + 3x + 12 - 2x - 2 =
x² + 4x + 3x - 2x + 12 - 2 =
x² + 5x + 10

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3x(x - 1) + (x + 2)(x + 5) =
3x² - 3x + x² + 5x + 2x + 10 =
3x² + x² - 3x + 5x + 2x + 10 = 
4x² + 4x + 10