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ICSE Class 9 Answered

open parentheses x plus 4 close parentheses open parentheses x plus 4 close parentheses minus 5 x y minus 20 y equals 6 y cross times 6 y  plz solve it and reply......
Asked by jsarkar99 | 15 Feb, 2019, 11:56: PM
answered-by-expert Expert Answer
There are two variables x and y in the given equation. To solve completely we need two equations.
Since only one equation is given, It is tried to express y in terms of x.
 
(x+4)(x+4) -5xy - 20y = 36y2
 
x2 +8x +16 -5xy -20y = 36y2
 
36y2 +20y -16 = x2 +8x -5xy
 
4(9y2 +5y -4 ) = x2 +8x -5xy
 
4(9y-4)(y+1) = x2 +8x -5xy
Answered by Thiyagarajan K | 16 Feb, 2019, 04:58: PM

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