If f(x) = -5 - 7x, find f(-2) ?

2009-02-10 7:44 am

i have no idea how to solve this will someone show me how to solve it please?

更新1:

oh my bad i thought "find f-2" ment once you find the answer find it times negative 2 haha well thank you everyone you did help

回答 (12)

2009-02-10 7:53 am

✔ 最佳答案

f(-2)..... this means put (-2) in place of x in the equation (-5 - 7x).

= -5 - 7(-2)
= -5 + 14
= 9

:o)

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2009-02-10 6:51 pm

f(x) = -5 - 7x
f(-2) = -5 - 7(-2)
f(-2) = -5 - (-14)
f(-2) = -5 + 14
f(-2) = 9

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2009-02-10 4:33 pm

f (-2) = - 5 - 7 (- 2)
f (-2) = - 5 + 14
f (-2) = 9

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2009-02-10 3:57 pm

substitute x with -2

f(-2)= -5 - 7(-2)

f(-2)= -5 + 14

= -5 + 14

= 9

the result

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2009-02-10 3:51 pm

f(x) = -5 - 7x
f(-2) = -5 - 7x
=-5 - (7 x -2)
=-5 - -14
=9

參考: maths lover

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2009-02-10 3:49 pm

substitute x with -2
so
f(-2)= -5 - 7(-2)
f(-2)= -5 - -14 <-------------- thats negative five minus negative fourteen
= -5 + 14
= 9

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2009-02-10 3:48 pm

You have to sub in the -2 for x, so =-5-7(-2)
=9

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2009-02-10 3:47 pm

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2009-02-10 3:47 pm

just plug -2 into the x.
-5 - 7(-2)
-5 + 14
=9

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2009-02-10 3:47 pm

Who cares, google it

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