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2014-08-30T11:17:12+03:00
A² -b²=45

(a-b)(a+b)=45

15(a-b)=45

a-b=3

5a-5b=5(a-b)=5*3=15
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2014-08-30T11:19:38+03:00
A^2-b^2=(a+b)(a-b)
a+b=15
a^2-b^2=45 
=> 15(a-b)=45 
=> a-b=3
5a-5b=5(a-b)=5*3=15
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