I have a test tommorow and Im in grade 8 algebra 1

Could somebody walk me through these 2 questions so i know if im doing it right or not?

2(1-d) - (2d+1)

5(2-j) + (2j-3)

Cheers,

Sam

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- Aug 18th 2005, 01:48 PMwhy-do-i-have-to-registerThe distiributive property
I have a test tommorow and Im in grade 8 algebra 1

Could somebody walk me through these 2 questions so i know if im doing it right or not?

2(1-d) - (2d+1)

5(2-j) + (2j-3)

Cheers,

Sam - Aug 20th 2005, 09:09 AMaskmemath
2(1-d) - (2d+1)

Since the 2 is outside the brackets, we remove the brackets and multiply BOTH variables with 2.

That gives you 2 -2d

Now,the negative sign is outside the brackets for the 2nd eqn.So we multiply both variables with the -ve sign.

That gives you -2d -1

Combining both you get 2-2d -2d -2

That leaves you with -4d.

Can you try for the next problem?