Solve 15x15=

$$15x15=$$

Evaluate

$$15x_{15}$$

Steps For Long Multiplication

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

$$\begin{array}{c}\phantom{\times9}15\\\underline{\times\phantom{9}15}\\\end{array}$$

Now multiply the first number with the 1^{st} digit in 2^{nd} number to get intermediate results. That is Multiply 15 with 5. Write the result 75 at the end leaving 0 spaces to the right like this.

$$\begin{array}{c}\phantom{\times9}15\\\underline{\times\phantom{9}15}\\\phantom{\times9}75\\\end{array}$$

Now multiply the first number with the 2^{nd} digit in 2^{nd} number to get intermediate results. That is Multiply 15 with 1. Write the result 15 at the end leaving 1 spaces to the right like this.

$$\begin{array}{c}\phantom{\times9}15\\\underline{\times\phantom{9}15}\\\phantom{\times9}75\\\underline{\phantom{\times}15\phantom{9}}\\\end{array}$$

Now add the intermediate results to get final answer.

$$\begin{array}{c}\phantom{\times9}15\\\underline{\times\phantom{9}15}\\\phantom{\times9}75\\\underline{\phantom{\times}15\phantom{9}}\\\phantom{\times}225\end{array}$$

Differentiate w.r.t. x_15

$$15$$

Steps Using Definition of a Derivative

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

$$15x_{15}^{1-1}$$

Subtract 1 from 1.

$$15x_{15}^{0}$$

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

$$15\times 1$$

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

$$15$$