Use completing the square to solve for x in the equation (x+7)(x-9)=25 A. x=-4 or 6
B. x=-2 or 14
C. x=1+/- the square root of 89
D. x=1+/- the square root of 87

C

Step-by-step explanation:

(x+7)(x-9)=25

x^2-2x-63=25

x^2-2x-88=0

(x^2-2x+1)-1-88=0

(x-1)^2=89

x=1 +/- the square root of 89

Hope this helps!

x= 1±√89

Step-by-step explanation:

(x+7)(x-9)=25

x²-9x+7x-63=25

x²-2x+1- 64=25

(x-1)²= 25+64

(x-1)²=89

x-1= ± √89

x= 1±√89

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.