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Find the x and y intercepts
f(x) = -x^2+4x+45
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Rita1975
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X intercept means plug in f(x) = 0 and solve for x
Y intercept means plug in x =0 and find f(x)
LagrangeSon678
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|dw:1314673518595:dw|
anonymous
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y intercept is the constant
in this case it is (0,45)
mathtard
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ok, so how do i get the x intercept?
LagrangeSon678
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i just got them for you
LagrangeSon678
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did you look at the drawing
LagrangeSon678
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|dw:1314673935920:dw|
mathtard
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so 0,45 isn't correct?
LagrangeSon678
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that is the y intecept
LagrangeSon678
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the i wrote (9,0) and (-5,0) are the x intercpets
mathtard
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ok I guess Im just confused now.
LagrangeSon678
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thats cause you need to study more
mathtard
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I guess I do, but you are here to help people who don't get it as easily as you do right?
LagrangeSon678
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yeah i am
LagrangeSon678
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here man, check this out:
To find the x intercepts, set y to be 0 and factor the polynomial like i did above, then set each term to zero and solve for x.
To find the y intercept, set x to be zero and evaluate