answersLogoWhite

0


Best Answer

81.

To complete the square, halve the coefficient of the x term (18/2 = 9) and add the square of this (92 = 81) to both sides:

x2 + 18x = -13

⇒ x2 + 18x + 81 = -13 + 81

⇒ (x + 9)2 = 68

User Avatar

Wiki User

โˆ™ 2011-08-31 09:40:15
This answer is:
User Avatar
Study guides

Algebra

20 cards

A polynomial of degree zero is a constant term

The grouping method of factoring can still be used when only some of the terms share a common factor A True B False

The sum or difference of p and q is the of the x-term in the trinomial

A number a power of a variable or a product of the two is a monomial while a polynomial is the of monomials

โžก๏ธ
See all cards
3.74
โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…โ˜†โ˜…
1018 Reviews

Add your answer:

Earn +20 pts
Q: What number must you add t complete the square x2 plus 18x equals -13?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions
People also asked