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" 15."-a-[a+{a+b-2a-(a-2b)}-b]...

" 15."-a-[a+{a+b-2a-(a-2b)}-b]

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15. "a^(2)-b^(2)-a-b

Find the value of a ,b,c and d from the equation : [{:(a-b,2a+c),(2a-b,3c+d):}]=[{:(-1,5),(0,13):}] .

If a=-2 , b=-1 ,then a^(b)-b^(a) is equal to a) -1 b) 0.5 c) -2 d) -1.5

Factorise: 15ab ^(2) - 20 a ^(2)b

Find the value of a if [(a-b,2a+c),(2a-b,c+d)]=[(-1,5),(0,13)]

Find the value of a if [(a-b,2a+c),(2a-b,c+d)]=[(-1,5),(0,13)]