Question

a) 3x + 2.5x - 10 = -49

b) 2x+ 3. (2x + 7) = 13

c) 3x + 2x + 3 (x + 1) = 10

d) 4x + 2 (x + 2) - 10 = 0

e) x + 2 = 7
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5

Answer 1

a)
3x + 2.5x - 10 = -49
3x + 2.5x = 10 - 49
5.5x = 10-49
5.5x = -39
x = -39/5.5
x = -7,09

b)
2x +3•( 2x+7) = 13
2x +6x +21 =13
2x +6x = 13 -21
8x = -8
8x= -8/8
x= -1

c)
3x +2x +3 ( x+1) = 10
3x +2x +3x +3 = 10
3x +3x +2x = 10 -3
8x = 7
x= 7/8
x= 0,87

d)
4x +2 (x+2) -10 = 0
4x +2x +4 -10 = 0
4x +2x = 0 -4 +10
6x =6
x= 6/6
x=1