Respuesta :

hi

You will only progress by trying yourself.  

so I do the first, you do the rest.

You have to remplace  x by 3

so first expression is :   x²-4x  

by remplacing "x" by it's value (3) we have :  

(3)² -4(3)  =  9 -12 = -3

Have a try for the rest and ask in comment if you dont understand.

Sprnt

Answers / Step-by-step explanation:

Expression 1.

1. Write the expression.

[tex]x^2-4x[/tex]

2. Substitute x by the given value and calculate.

[tex](3)^2-4(3)=\\ \\9-12=\\ \\-3[/tex]

-------------------------------------------------------------------------------------------------------------------

Expression 2.

1. Write the expression.

[tex]3x^2[/tex]

2. Substitute x by the given value and calculate.

[tex]3(3)^2=\\ \\3(9)=\\ \\27.[/tex]

-------------------------------------------------------------------------------------------------------------------

Expression 3.

1. Write the expression.

[tex]2x^3[/tex]

2. Substitute x by the given value and calculate.

[tex]2(3)^3=\\ \\2(27)=\\ \\54.[/tex]

Otras preguntas