What number must you add to complete the square ? x^2-18x=29

 The required number to be added is 81.

Step-by-step explanation:  We are given to find the number that must be added to both sides of the equation below to complete the square.

Completing the square means adding a suitable number to an expression such that is becomes a perfect square trinomial.

We have from equation (i) that

Thus, the required number to be added is 81.

15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)