Question

4. (a) Simplify 3x (4x – 5) +3 and find its values for (i)x= 3 (ii)x=1
(b) Simplify aſa?+a+1) + 5 and find its value for (i) a=0, (ii) arī
(iii) a=-1.​

Answer 1

Explanation:

this is the answer by taking x=3;1

Answer 2

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3x(4x−5)+3=12x^2−15x+3

x=3 gives the value 12(9)−15×3+3

                             =108−45+3

                              =66

x=1/2 gives the value 12(1/4)−15×(1/2)+3

                             =3−7.5+3

                              = - 3/2