3x+4=-8 solve this equation using mental mathematics?
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3x+4=-8 solve this equation using mental mathematics?
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Answer:
x = -4
Step-by-step explanation:
3x + 4 =- 8
3x = -8 -4
3x = -8 + (-4)
3x = -12 ( So divide both side of the equation by 3)
3x/3= -12/3
x= -4
Checking:
Let x = -4
3x +4 = -8
3 (-4) + 4 = -8
-12 + 4 = -8
-8=-8
Answer:
Step-by-step explanation:
Step 1: Subtract 4 from both sides.
3x+4−4=−8−4
3x=−12
Step 2: Divide both sides by 3.
3x
3
=
−12
3
x=−4