The first few steps in deriving the quadratic formula are
sshown
Which best explains why
b?
40?
is not added to the left side of
the equation in the last step shown in the table?
-c-axbx
Use the subtraction property of
equality
Factor out a
The term
is added to the right side of the equation,
49²
Find half of the b value and square
it to determine the constant of the
perfect square trinomial
20
D
D
40
so it needs to be subtracted from the left side of the
equation to balance the sides of the equation,
The distributive property needs to be applied to determine
the value to add to the left side of the equation to balance
the sides of the equation
The term
b?
402
needs to be converted so it has a common
denominator before adding it to the left side of the equation
to balance the equation,
The square root of the term needs to be found before
adding the term to the left side of the equation to balance