Question

4. simplify 3x(4x-5)+ 3 and find its values for (i) x=3 (ii) x=½​

Answer 1

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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