Question

Simplify 3x(4x-5)+3 and find its values for x is equal to 3
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Answer 1

3 x ( 4x - 5 ) + 3 = 3

12x - 15 + 3 = 3

12x - 12 = 3

12x = 3 + 12

x = 15/12

x = 5/4 ➡ Answer

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