Perlorm the indicated operation. $$ \left(3 x^{3}-7 x^{2}+5 x-4\right)-\left(8 x^{3}-2 x^{2}-4 x+9\right) $$ Write the polynomial in standard form. $$ \left(3 x^{3}-7 x^{2}+5 x-4\right)-\left(8 x^{3}-2 x^{2}-4 x+9\right)=-5 x^{3}-5 x^{2}+9 x-13 $$ What is the degree of the polynomial? $$ \square $$ (Type a whole number.)

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Calculate or simplify the expression $$ (3x^3-7x^2+5x-4)-(8x^3-2x^2-4x+9) $$.
Simplify the expression by following steps:
- step0: Solution:
  $$\left(3x^{3}-7x^{2}+5x-4\right)-\left(8x^{3}-2x^{2}-4x+9\right)$$
- step1: Remove the parentheses:
  $$3x^{3}-7x^{2}+5x-4-\left(8x^{3}-2x^{2}-4x+9\right)$$
- step2: Remove the parentheses:
  $$3x^{3}-7x^{2}+5x-4-8x^{3}+2x^{2}+4x-9$$
- step3: Subtract the terms:
  $$-5x^{3}-5x^{2}+9x-13$$
The result of the operation is $$-5x^{3}-5x^{2}+9x-13$$.

The degree of the polynomial is 3.
The degree of the polynomial is 3.

Perlorm the indicated operation.

Write the polynomial in standard form.

What is the degree of the polynomial?

(Type a whole number.)

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Perlorm the indicated operation. Write the polynomial in standard form. What is the degree of the polynomial? (Type a whole number.)