Question

What number must you add to complete the square?

x^2+20x=33

Answer 1

Do you know how to complete the square?

Answer 2

HINT
x^2+2*10*x+( )=33+( )

Answer 3

Nope, what is the formula?

Answer 4

(x+a)^2=x^2+2ax+a^2

Answer 5

you want to write the left hand as this, and the right hand should be completely constant.

Answer 6

(can be a number, but no x or x^2)

Answer 7

hmm...
so
there is '20x'. so fo it to be a the '2ab' thingy in the expansion of "(a+b)^2 = a^2 +b^2 +2ab", 20x = 2*x*20. a=x, so b=20. so b62 = 400

so basically, -33 + *some no.* = 400

now what could that *some no.* be?

Answer 8

Thanks.

Answer 9

@apoorvk , nice steal :S

Answer 10

Lo;, what steal?