Question

Simplify:3x(4x-5)+3.Find its value for = a)x=3 b)x = 1/2​

Answer 1

For x=3 ans. is 111

For x=1/2 ans is -3/2

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