26-05-2017
Mathematics

contestada

what is the value of -4k+2(5k-6)= -3k - 39

Respuesta :

26-05-2017

-4k+2 (5k-6)=-3k-39
-4k+10k-12=-3k-39
6k-12=-3k-39
+3k both sides
9k-12=-39
+12 both sides
9k=-27
÷9 both sides
k=-3

check

-4 (-3)+2 (5 (-3)-6)=-3 (-3)-39
12+2 (-15+-6)=9-39
12+2 (-21)=9-39
12-42=-30
-30=-30
k=-3 holds true

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