How do you evaluate #3+ 4d - 14= 15- 5d - 4d# ?

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Answer 1 · 2016-12-31T11:01:56

#d=2#

To 'evaluate' means to find the value of an expression.
We can't evaluate in this case because we do not know the value to use for #d#

This is an equation which we can solve, which means to find the value of the variable which makes the equation true.

#3+4d-14 = 15-5d-4d" "larr# add 9d to both sides

#3+4d-14 color(blue)(+9d)= 15-5d-4dcolor(blue)(+9d)#

#-11+13d = 15" "larr# add +11 to both sides

#-11+13dcolor(red)(+11) = 15color(red)(+11)#

#13d= 26#

#d=2#

Evaluating both sides gives:

#3+4(2)-14 = 15-5(2)-4(2)#

#-3 = -3#

Answer 2 · 2016-12-31T11:18:54

#d=2#

#3+4d-14=15-5d-4d#

#4d+5d+4d=15-3+14#

#13d=26#

#d=2#
substitute d=2

#3+4(2)-14=15-5(2)-4(2)#

#3+8-14=15-10-8#

#-3=-3#