Math and Arithmetic

# How is a plus b over a minus b equals c plus d over c minus d?

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###### 2010-12-07 13:44:04

(a + b)/(a - b) = (c + d)/(c - d) cross multiply

(a + b)(c - d) = (a - b)(c + d)

ac - ad + bc - bd = ac + ad - bc - bd

ad = bc that is the product of the means equals the product of the extremes

a/b = b/c

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## Related Questions

x equals negative b plus or minus the square root of b squared minus 4bc over 2a

If a equals 3 and b equals minus 5 then a minus b equals what

Commutative, not communtative The mathematical property of being able to change the order of the numbers and not change the answer. A plus B equals B plus A (1 plus 3 equals 4, 3 plus 1 equals 4) A times B equals B times A (2 times 5 equals 10, 5 times 2 equals 10) Addition and multiplication are commutative operators A minus B is not necessarily equal to B minus A (6 minus 4 equals 2, 4 minus 6 equals minus 2) A divided B is not necessarily equal to B divided A (9 divided by 3 equals 3, 3 divided by 9 equals one-third) Subtraction and division are not commutative operators

20a plus 14 will be 34a minus 8a minus 7 34a minus 8 is 26a minus 7 is 19a. The single b is 1b plus 6b which is 7b minus 2b equals 5b.

If your Problem is organized like this: A x squared plus B x plus C, the equation is: (B plus or minus the square root of(B squared minus 4 A C)) over 2A

The Quadratic Formula song: (my grade saver) To the tune of the jack in the box song X equals negative B plus or minus square root of B squared minus 4AC all over 2A :)

Yes, A minus is better than a B plus.

A - B = 11A = 11 + whatever ' B ' is.

negative b plus or minus the square root of b minus 4 times ac all over 2 a

negative b plus or minus the square root of b squared minus 4AC all over 2 A

well if the coefficient of a times the negative reciprical of b equals 4.33 then if you add all of them they should be able to fit in as themselves int the equation: x=-b(plus or minus) (the sqare root of:(b)(b)+-4ac) all divided by 2a, the basic quadratic equation its elementery me dear lad

The quadric equation is: negative b plus or minus the square root of b squared minus 4ac all over(divided by) 2a

-b/(b-a) ? Multiply both top AND bottom by -1 : +b/(-b+a) which is b/(a-b)

b + 9 = 21 Take the + 9 across the other side of the equals sign. a plus becomes a minus. b = 21 - 9 so... b = 12. This can be checked by setting b to 12 in the first equation b + 9 = 21 12 + 9 = 21 which is correct.

carry the six then use the quadratic formula negative b plus or minus the squrare root of b squared minus 4 ac all over 2

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