Question

PLEASE HELP ASAP

When solving this equation by completing the square, which of the following shows the equation with the square completed?

x2 - 4x - 32 = 0

I'm having a lot of trouble with quadratics :/

Answer 1

ax2-bx+c
c is b/2 and then squared

Answer 2

so C would be 4

Answer 3

I'm confused. The answer choices are x2 - 4x - 32 = 0
A)(x - 4)2 = 36
B)(x - 2)2 = 36
C)(x - 8)2 = 4

@bmk614

Answer 4

well when you take that you need to add 32 to both sides but then add 4 to both sides. Then you factor the (x2-4x+4) it would be (x-2)2=36

Answer 5

"equation with the square completed?"

Please express your exponentiation with the symbol ^:

x^2 - 4x - 32 = 0 correct
x2 - 4x - 32 = 0 incorrect

Given x^2 - 4x - 32 = 0, our task is to rewrite x^2-4x as a perfect square of a binomial.

1. Take the coefficient of the x (first power of x): Here it's -4.
2. Take half of that coefficient. Here, that would be -4/2, or -2.
3. Square this last result. Here, that would be (-2)^2, or 4.
4. Write x^2 - 4x - 32 = 0 as x2 - 4x - 32 = 0
Add that 4, and then subtract 4 (net is zero) in the empty space above.

See if you can finish this work. Show all work you do, please. What is the square root of x^2-4x + 4?

Answer 6

Thank you @bmk614 and @mathmale