Question

Simplify 3x(4x-5)+3 and find its values for (1) x=3, (2) x=1/2

Answer 1

Answer:

1. 66

2. - 3 / 2

Step-by-step explanation:

Equation = 12x^2 - 15x +3

If x = 3

Ans = 108 - 45 +3

= 66

If x = 1/2

Ans = ( 6 - 15 + 6)/2

= - 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