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(a) Simpify 3 xx (4x-5)+3 and find its v...

(a) Simpify `3 xx (4x-5)+3` and find its values for (i) `x=3` (ii) `x=1/2.` (j) simplify `a(a^2+a+1)+5` and find its value for (i) `a=0` (ii) `a=1` (iii) `a=-1`

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