Question

a) 3 . 15 - 4 . 5 + 1
b) 5 . (-10) - 2 . (-4) + 5 . (-3) . (-1)
c) (-40) : (-8) + (-64) : 8
d) -4³ . 2 +3 .(-5) - 5³ . 2 .4
e) 2x - 3 = 17
f) 4x +7= x-8
g) 3 - 7 (1 - 2x) = 5 - (x-9)
h) 2 (2x + 7) + 3 (3x - 5)= 3 (4x + 5) - 1

Answer 1

A) 3 . 15 - 4 . 5 + 1 ==> 45 - 20 = 1 ==> 21
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b) 5(-10) - 2 . (-4) + 5(-3) . (-1) ==> - 50 + 8 - 15( - 1) ==> - 42 + 15 ==> - 27 
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c) (-40) : (-8) + (-64) : 8 ==> + 5 + (- 8) ==> 5 - 8 ==> - 3 
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d) -4³ . 2 +3(-5) - 5³ . 2 .4 => - 64.2 - 15 - 125.8 => - 128 - 15 - 1000 => -1143
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e) 2x - 3 = 17 ==> 2x = 17+3 ==> 2x = 20 ==> x = 10
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f) 4x +7= x-8 ==> 4x - x = - 8 - 7 ==> 3x = - 15 ==> x = - 5
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g) 3 - 7 (1 - 2x) = 5 - (x-9) ==> 3 - 7 + 14x = 5 - x + 9

14x + x = 9 - 3 + 7 + 5 ==> 15x = 18 ==> x = 18/15
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h) 2 (2x + 7) + 3 (3x - 5)= 3 (4x + 5) - 1

4x + 14 + 9x - 15 = 12x + 15 - 1 ==> 13x - 12x = - 1 + 1

x = 0