Simplify rational fraction <mstyle mathsize="1.2em"> b x

res2bfitjq

res2bfitjq

Answered question

2022-05-20

Simplify rational fraction
b x ( a 2 x 2 + 2 a 2 y 2 + b 2 y 2 ) + a y ( a 2 x 2 + 2 b 2 x 2 + b 2 y 2 ) b x + a y
My attempt:
b a 2 x 3 + 2 a 2 b x y 2 + b 3 x y 2 + a 3 x 2 y + 2 b 2 x 2 a y + b 2 a y 3 b x + a y
I multiplied it out like this, then got stuck...

Answer & Explanation

Leah Conley

Leah Conley

Beginner2022-05-21Added 12 answers

First, let's pull out the b x and a y in the numerator:
b x ( a 2 x 2 + 2 a 2 y 2 + b 2 y 2 ) + a y ( a 2 x 2 + 2 b 2 x 2 + b 2 y 2 ) = ( b x + a y ) ( a 2 x 2 + b 2 y 2 ) + 2 a 2 b x y 2 + 2 a b 2 x 2 y = ( b x + a y ) ( a 2 x 2 + b 2 y 2 ) + a y ( 2 a b x y ) + b x ( 2 a b x y ) = ( b x + a y ) ( a 2 x 2 + 2 a b x y + b 2 y 2 ) .
Now divide out the b x + a y and factor to get
a 2 x 2 + 2 a b x y + b 2 y 2 = ( a x + b y ) 2 .
Monfredo0n

Monfredo0n

Beginner2022-05-22Added 6 answers

In numerator, the factor a 2 x 2 + b 2 y 2 is common, then
b x ( a 2 x 2 + 2 a 2 y 2 + b 2 y 2 ) + a y ( a 2 x 2 + 2 b 2 x 2 + b 2 y 2 ) b x + a y =
( a 2 x 2 + b 2 y 2 ) ( b x + a y ) + 2 a 2 y 2 b x + 2 b 2 x 2 a y b x + a y =
( a 2 x 2 + b 2 y 2 ) ( b x + a y ) + 2 a b x y ( b x + a y ) b x + a y =
( a 2 x 2 + b 2 y 2 + 2 a b x y ) ( b x + a y ) b x + a y =
a 2 x 2 + b 2 y 2 + 2 a b x y = ( a x + b y ) 2 .

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