f(x) = -15x -10
g(x) = 12x +10
find: f(f(7))
2006-09-10 07:43:10 · 8 answers · asked by alishas927 1 in Science & Mathematics ➔ Mathematics
f(7) = -15(7) - 10 = -115 Now, plug this answer into f(x).
f(-115) = -15(-115) - 10 = 1725 - 10 = 1715.
This is the easiest way if you are not asked to find f(f(x)).
2006-09-10 07:54:59 · answer #1 · answered by tbolling2 4 · 1⤊ 0⤋
f(x) = -15x - 10
f(7) = -15*7 - 10 = -115
f(f(7)) = ((-15)*(-115))-10 = 1715
Do the maths urself ?? whats the use of g(x) here ??
f(f(x)) = -15(-15x -10) - 10 = 225x + 150 -10 = 225x + 140
f(f(7)) = 225*7 + 140 = 1715
2006-09-10 07:57:46 · answer #2 · answered by Amrendra 3 · 0⤊ 0⤋
f(f(x)) = f(-15x - 10) = -15(-15x - 10) - 10 = 225x + 150 - 10 = 225x + 140
f(f(7)) = 225(7) + 140 = 1575 + 140 = 1715
f(f(7)) = 1715
2006-09-10 13:18:08 · answer #3 · answered by Sherman81 6 · 0⤊ 0⤋
f(x) = -15x -10
f(f(x))
= f(-15x-10)
= -15f(x) -f(10)
= -15(-15x -10) -10
= 225x + 150 -10
= 225x + 150 - 10)
= 225x + 140
So, f(f(7))
= 225*7 + 140
= 1715
2006-09-10 07:59:33 · answer #4 · answered by M1976 2 · 0⤊ 0⤋
well, u never needed anything with g(x) so i can exclude that yes?
f(7)= -15(7)-10
f(7)= -105 -10
f(7)= -115
then u take ure answer of f(7) and plug it into f(x) again (since u are functioning the function on x if that makes since =P)
f(-115)= -15(-115) -10
f(-115)= 1725 -10
f(-115)= 1715
so ure final answer of f(f(7)) is 1715, hope this helps!
2006-09-10 07:55:33 · answer #5 · answered by soccerdude 2 · 0⤊ 0⤋
f(f(x)) = -15(-15x-10) - 10
f(f(x)) = 225x + 150 - 10
f(f(7)) = 225(7) + 150 - 10
f(f(7)) = 1715
2006-09-10 07:51:43 · answer #6 · answered by عبد الله (ドラゴン) 5 · 1⤊ 0⤋
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2016-11-07 01:16:39 · answer #7 · answered by filonuk 4 · 0⤊ 0⤋
Please review:
http://www.purplemath.com/modules/fcns.htm
2006-09-10 07:57:53 · answer #8 · answered by Anonymous · 0⤊ 0⤋