Question

MEDAL AND FAN

Solve x2 + 8x − 3 = 0 using the completing-the-square method.
x = four plus or minus the square root of three
x = negative four plus or minus the square root of three
x = four plus or minus the square root of nineteen
x = negative four plus or minus the square root of nineteen

Answer 1

x^2+8x-3=0 fits the form ax^2+bx+c where a=1, b=8, and c=-3.

Answer 2

To complete the form, what do we need to do?

Answer 3

that's what im having trouble with

Answer 4

Well, we need to add 16 and subtract 16.

Answer 5

Want to know where I got 16 from?

Answer 6

It's really simple.

Answer 7

Well, 16 is a constant right?

Answer 8

So we say: Let constant= (b/2)^2

Answer 9

Then, b=8

Answer 10

Therefore, K= (b/2)^2= (8/2)^2= 16

Answer 11

x=-4+/19 the divide thing it goes up then over then the 19 is under it i used mathway.com