what is (c+d) - (c-d)?

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2007-05-10 11:41:29 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

i got 2d. is that right?

2007-05-10 11:44:40 · update #1

yeah 2d

2007-05-10 11:48:55 · answer #1 · answered by Goddess of Grammar 7 · 0⤊ 0⤋

This may be written as:-
(c + d) - 1.(c - d)
= c + d - c + d
= c - c + d + d
= 2d (agrees with your answer)

2007-05-11 03:39:34 · answer #2 · answered by Como 7 · 0⤊ 0⤋

Yes, you have the right answer.

Distribute the minus sign:
(c + d) + (-c + d)
c + d + -c + d
The c cancels out
d + d
2d

2007-05-10 18:49:21 · answer #3 · answered by coconutty beanz xD 4 · 0⤊ 0⤋