Use completing the square to solve for x in the equation (x minus 12) (x + 4) = 9. x = –1 or 15 x = 1 or 7 x = 4 plus-or-minus StartRoot 41 EndRoot x = 4 plus-or-minus StartRoot 73 EndRoot
Mathematics · Middle School · Tue Nov 03 2020
llm
Answered on
Given the equation:
( x - 12) ( x + 4) =9
Solve for x.
Solution:
In order to solve for x, we simply needed to equate the factors to 0.
x - 12 = 0
x + 4 = 0
Now we need to transpose -12 and 4 to the opposite sides of the equation, hence it must be taken to note that in transposing a number, the sign changes.
x = 12
x = -4
Final answer:
x = 12
x = -4