In this video, we're gonna solve
x squared plus eight x plus 16 equals zero
using the quadratic formula.
So we'll have x equals negative eight
plus or minus the square
root of eight squared
minus four times one times 16
all over two times one.
That turns into negative
eight plus or minus
the square root of eight squared is 64
minus four times one times 16
is also 64 over two.
Then we have x equals negative eight
plus or minus the square
root of zero over two,
which of course the square
root of zero is just zero,
so we have negative eight
plus or minus zero over two.
So since negative eight plus zero
and negative eight minus
zero is the same thing,
we'll actually have a
repeat solution here.
So x is gonna be equal to
negative eight over two,
which is negative four.
