Question

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

Answer 1

Step-by-step explanation:

x = ½

• 3x (4x - 5) + 3
• 3*½ (4*½ - 5) + 3
• $\frac{ 3 }{ 2 }$ × (-3 + 3)
• $\frac{ 3 }{ 2 }$ × 0
• 0

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