Question

Can someone please evaluate the expression with X=3 with work shown? Please and thank you

Answer 1

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.

Answer 2

Answers / Step-by-step explanation:

Expression 1.

1. Write the expression.

$x^2-4x$

2. Substitute x by the given value and calculate.

$(3)^2-4(3)=\\ \\9-12=\\ \\-3$

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Expression 2.

1. Write the expression.

$3x^2$

2. Substitute x by the given value and calculate.

$3(3)^2=\\ \\3(9)=\\ \\27.$

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Expression 3.

1. Write the expression.

$2x^3$

2. Substitute x by the given value and calculate.

$2(3)^3=\\ \\2(27)=\\ \\54.$