Question

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

Answer 1

Here is your answer dear⛄

❤ If x = 3

• 3x (4x - 5) + 3
• 3*3 (4*3 - 5) + 3
• 9 (12 - 5) + 3
• 9 × 7 + 3
• 9 × 10
• 90

❤ If x = ½

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

cancel ❌ -3 and +3

• $\frac{3}{2}$

$\huge\colorbox{pink}{MysticalGiggles}$

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