a+b/a-b = 5/4 then a/b = ?
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a+b/a-b =5/4=> 4(a+b)=5(a-b)=> 4a+4b=5a-5b =>9b=a => a/b=9.
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If a+b=5,a-b=1, then what is 2ab? 130 Views.
16 votes
*A2A [math]4ab=16\tag*{}[/math] [math]\begin{align}4ab&=(a+b)^2-(a-b)^2\16&=25-(a-b)^2\(a-b)^2&=9\ ... More
3 votes
Use substitution A=5-b b(5-b)=4 5b-b^2=4 b^2–5b+4=0 Factor (b-4)(b-1)=0 b=4,1 ... More
2 votes
The following identity will help you (so first prove that it’s generally true): [math](a-b)^2 ... More
1 vote
(a+b)²=5² a²+b²+2ab=25 substitute ab in above equation:
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