Question

solve the equation and show the steps
16+x^2-8x=0

Answer 1

it can be written

x^2 - 8x + 16 = 0 find the factors of 16 that add to -8.... hint both are negative

Answer 2

the factors would be -4 and -4 but what do i do with that?

Answer 3

then you have

x-4)(x -4) = 0

solve x - 4 = 0

this will be the solution

Answer 4

would i use foil?

Answer 5

would the answer be x=4?

Answer 6

no... you have (x -4)(x-4)=0 either expression can be zero to give an zero answer

0*(x-4) = 0 or (x -4)*0 = 0

so what value of x makes x - 4= 0

Answer 7

thats the answer x = 4 its called repeated root.

Answer 8

oooo ok i get it. thanks!