SOLUTION: Find the x-intercepts and y intercepts for f(x) f(x)=x^2-8x+11 I dont know is this is correct, i got the x intercepts are (4(+-) sqrt5/2,0)
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Question 155620
:
Find the x-intercepts and y intercepts for f(x)
f(x)=x^2-8x+11
I dont know is this is correct, i got the x intercepts are (4(+-) sqrt5/2,0)
Answer by
jim_thompson5910(35256)
(
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):
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X-Intercept(s)
Start with the given function
Plug in
Notice we have a quadratic equation in the form of
where
,
, and
Let's use the quadratic formula to solve for x
Start with the quadratic formula
Plug in
,
, and
Negate
to get
.
Square
to get
.
Multiply
to get
Subtract
from
to get
Multiply
and
to get
.
Simplify the square root (note: If you need help with simplifying square roots, check out this
solver
)
Break up the fraction.
Reduce.
or
Break up the "plus/minus"
So the answers are
or
which approximate to
or
So the x-intercepts are
and
which in decimal form is (6.236,0) and (1.764)
Y-Intercept
Start with the given equation.
Plug in
.
Square
to get
.
Multiply
and
to get
.
Multiply
and
to get
.
Combine like terms.
So the y-intercept is (0,11)