Study guides

☆☆

Q: 15 plus 3x 42 then x?

Write your answer...

Submit

Still have questions?

Related questions

3x + 12 = 42 3x = 30 x = 10

3x+42=6x+12 42=6x-3x+12 42=3x+12 42-12=3x 30=3x 10=x

x+5 = 3x+15 x-3x = 15-5 -2x = 10 x = -5

x+(x+1)+(x+2)=42 3x+3+42 3x=45 x=15 x+1=15 x=14 x+2=15 x+13 so the three consecutive numbers are 13,14, and 15

3x - 5 + 3x = 1x + 15 3x + 3x -1x = 15 + 5 5x = 20 5x/5 = 20/5 x = 4

It is -x -15.

3x+12x = 15 15x = 15 x = 1

X=5

6x + 4 = 3x + 19 3x + 4 = 19 3x = 15 x = 5 Check it. 30 + 4 = 15 + 19 It checks.

3x+4=-11 3x=-15 x=-5

3x-7+4 = 42 3x-7 = 38 3x = 45 x=15

negative 15

x = 27

3x^2 -14x +15 = (3x-5)(x-3)

3x + 8 = -7 Therefore, 3x = -15 x = -5

x = -11

4x+7-3x = 15 4x-3x = 15-7 x = 8

15

x = 1

51.

It is 2x - 8

x = 2

x=5

3X + 5 = 203X = 15 X = 5

3x3 - 24x2 + 45x = 3x(x2 - 8x + 15) = 3x(x2 - 3x - 5x + 15) = 3x[ x(x - 3) - 5(x - 3) ] = 3x(x - 5)(x - 3)