exam Maths Puzzle Numerical Ability

1. (2p+7)3(exponent)

2. 3a8b3/9a-4b-6

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exam Other Question

let s be the set of all real numbers except -1. define * on s by a*b=a+b+ab.
a)show that * gives a binary operation on s.
B)show that (s,*) is a group.
c) find the solution of the equation 2*x*3=7 in s. how do variables affect the answer of a multiplication propblem when you have both variables and numbers?