Question

How do you solve x2 + 8x + 25 = 0

Answer 1

use the quadratric equation

Answer 2

you complete the square:
(x+a)²=x²+2ax+a²

Answer 3

so compare with what you have
x²+2ax+a²
x²+2(4)x+25

Answer 4

woould it be -4 +/- i

Answer 5

so a= 4 but we still need the a² so we add and substract
x²+2(4)x+ 4² -4²+25=0 =
(x+4)² = -9

Answer 6

x= -4+-3i i get

Answer 7

to test the solutions you can use http://www.wolframalpha.com/input/?i=x%C2%B2+%2B+8x+%2B+25+%3D+0
just don use it to do the whole whomework! =)

Answer 8

oh i think you want to use the complete the square method here?

Answer 9

yep, i think its better than learning the quadratic formula...

Answer 10

go to khan academy if ou dont know completing the square method

Answer 11

thank you