Question

what must you add to make it a complete square? x^2+8x=11?

Answer 1

you got this yes? half of 8 is 4, 4 squared is 16 done

Answer 2

+5

Answer 3

16

Answer 4

add 16 on both sides to make it a perfect square on the left hand side.
(x+4)^2=27

Answer 5

I just don't understand how to get these answers.... I wasn't taught this...

Answer 6

to get a perfect square see the single degree x term and see if u can seperate into equal half if so den multiply those term u will get a answer and den see wat number u can add to get that value hope ull get it

Answer 7

yah you just need to know the formula

(a+b)^2=a^2+2ab+b^2

you should get your equation in the form of a^2+2ab+b^2

from the question x^2+8x=11

x^2+8x-11=0

simplify like this

x^2+(2)(4)(x)-11=0

from that a=x and b=4

so -11 should be replaced by b^2 to make it perfect square

so to get b^2=16 add 27 .
then it becomes

x^2+8x+16=0