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find the value of the expressions if n = 4.

1) 2n - 7
2) 3n² + 2n - 5
3) -m³

Sagot :

MathWiz0001

Step-by-step explanation:

Substitute n = 4 into the expression:

[tex]2(4)-7[/tex]

Solve:

[tex]8-7[/tex]

[tex]1[/tex]

Substitute n = 4 into the expression:

[tex]3(4)^{2} +2(4)-5[/tex]

Solve:

[tex]48+8-5[/tex]

[tex]56-5[/tex]

[tex]51[/tex]

Substitute n = 4 into the expression:

Is the expression [tex]-n^{3} ?[/tex]

[tex]-4^{3}[/tex]

Multiply:

[tex]-4 \times -4 \times -4= -64[/tex]

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