You add a 1 under the 12 and 25
Step 1: Identify the variables.Step 2: Add/Subtract whole numbers so they're all on one side.Step 3: Add/Subtract Variables so they're all on one side.Step 4: Multiply /Divide to get the variable by itself.Step 5: Check your work.
Answer:
a = -5
Step-by-step explanation:
Given
-18 + 2a = 2(3a + 1)
Expand the bracket on the right
-18 + 2a = 2 x 3a + 2 x 1
-18 + 2a = 6a + 2
Add 18 to both sides
-18 + 18 + 2a = 6a + 2 + 18
2a = 6a + 20
Subtract 6a from both sides
2a - 6a = 6a - 6a + 20
-4a = 20
Divide both sides by -4
-4a/-4 = 20/-4
a = -5
21 because PEMDAS. 30 x 0 is 0 20 plus 1 is 21
One of the simplest ways is to find the last number as it isn't a coefficient of X
You can find it by multiplying the 2 numbers in the bracket without X. E.G the 1 from (3x+1) and the 3 from (x+3)
so we're looking for 3 as it isn't a coefficient of X
for A, (1x3)=3
For B (2x2)=4
for C (2x3)=6
For D (1X2)=2
so the answer is A