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dddan
 3 years ago
what is the LCD of x+7/2x^2+7x15 ; and x5/2x^25x+3?
dddan
 3 years ago
what is the LCD of x+7/2x^2+7x15 ; and x5/2x^25x+3?

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michaeln
 3 years ago
Best ResponseYou've already chosen the best response.0factor 2x^2+7x15 = (2x3)(x1) factor x5/2x^25x+3 = (2x3)(x+5) can you find the LCD now?

JakeV8
 3 years ago
Best ResponseYou've already chosen the best response.0Seems more like a GCF than an LCD, doesn't it? Odd question...

dddan
 3 years ago
Best ResponseYou've already chosen the best response.0so does this mean that the lcd is (2x3)(x1)(x+5)?

JakeV8
 3 years ago
Best ResponseYou've already chosen the best response.0I suppose so. If you had fractions where the first fraction had the first expression as a denominator and the 2nd fraction had the 2nd expression as its denominator, then the LCD would be the expression you just wrote...

JakeV8
 3 years ago
Best ResponseYou've already chosen the best response.0The point, I guess, is that by factoring FIRST, you realize that (2x3) is actually a common factor, and so you wouldn't multiply by that... if you just multiplied the original expressions together to try to get the LCD, it would be a common denominator, but it wouldn't be the LEAST one... it would be too big by an extra factor of (2x3)
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