Solve 20x45=

$$20 x 45 =$$

Evaluate

$$20x_{45}$$

Steps For Long Multiplication

First line up the numbers vertically and match the places from the right like this.

$$\begin{array}{c}\phantom{\times9}20\\\underline{\times\phantom{9}45}\\\end{array}$$

Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 5. Write the result 100 at the end leaving 0 spaces to the right like this.

$$\begin{array}{c}\phantom{\times9}20\\\underline{\times\phantom{9}45}\\\phantom{\times}100\\\end{array}$$

Now multiply the first number with the 2^{nd} digit in 2^{nd} number to get intermediate results. That is Multiply 20 with 4. Write the result 80 at the end leaving 1 spaces to the right like this.

$$\begin{array}{c}\phantom{\times9}20\\\underline{\times\phantom{9}45}\\\phantom{\times}100\\\underline{\phantom{\times}80\phantom{9}}\\\end{array}$$

Now add the intermediate results to get final answer.

$$\begin{array}{c}\phantom{\times9}20\\\underline{\times\phantom{9}45}\\\phantom{\times}100\\\underline{\phantom{\times}80\phantom{9}}\\\phantom{\times}900\end{array}$$

Differentiate w.r.t. x_45

$$20$$

Steps Using Definition of a Derivative

The derivative of ax^{n} is nax^{n-1}.

$$20x_{45}^{1-1}$$

Subtract 1 from 1.

$$20x_{45}^{0}$$

For any term t except 0, t^{0}=1.

$$20\times 1$$

For any term t, t\times 1=t and 1t=t.

$$20$$