Subtract: 2(10b+4)−(b−2) .

To subtract 2(10b+4)−(b−2), first apply the distributive property by multiplying 2 by each term inside the parentheses:

2(10b+4) = 20b + 8

Now we can rewrite the expression as:

20b + 8 - (b - 2)

To subtract the expressions inside the parentheses, distribute the negative sign to each term within the parentheses:

20b + 8 - b + 2

Now combine like terms:

(20b - b) + (8 + 2)

simplifies to:

19b + 10

Subtract: (3g−4)−2(3g+4)

To subtract (3g−4)−2(3g+4), first apply the distributive property by multiplying 2 by each term inside the parentheses:

2(3g + 4) = 6g + 8

Now we can rewrite the expression as:

(3g - 4) - (6g + 8)

To subtract the expressions inside the parentheses, distribute the negative sign to each term within the second set of parentheses:

3g - 4 - 6g - 8

Now combine like terms:

(3g - 6g) + (-4 - 8)

simplifies to:

-3g - 12

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