9x×5x+15x

To simplify the expression 9x × 5x + 15x, you need to distribute the product 9x to each term inside the parentheses:

9x × 5x = 45x^2

Then, add the product of 9x and 15x:

45x^2 + 9x × 15x = 45x^2 + 135x^2

Finally, combine like terms:

45x^2 + 135x^2 = 180x^2

So, the simplified expression is 180x^2.