I got a) 5x^2+1
b) (5x+1)^2
Is this correct? I'm so confused!
f(x)=5x+1 g(x)=x^2 find a) fg(x) b) gf(x)?
2009-04-23 10:00 am
回答 (4)
2009-04-23 10:17 am
✔ 最佳答案
a)f(x^2)=5x^2+1 answer//
b)
g(5x+1)=(5x+1)^2
=(5x+1)(5x+1)
=25x^2+10x+1 answer//
2009-04-23 10:26 am
f(x) = 5x + 1
g(x) = x^2
a)
f(x) = 5x + 1
f(x) â f[g(x)] = f(x^2)
f[g(x)] = 5(x^2) + 1
f[g(x)] = 5x^2 + 1
b)
g(x) = x^2
g(x) â g[f(x)] = g(5x + 1)
g[f(x)] = (5x + 1)^2
g[f(x)] = (5x + 1)(5x + 1)
g[f(x)] = 25x^2 + 10x + 1
g(x) = x^2
a)
f(x) = 5x + 1
f(x) â f[g(x)] = f(x^2)
f[g(x)] = 5(x^2) + 1
f[g(x)] = 5x^2 + 1
b)
g(x) = x^2
g(x) â g[f(x)] = g(5x + 1)
g[f(x)] = (5x + 1)^2
g[f(x)] = (5x + 1)(5x + 1)
g[f(x)] = 25x^2 + 10x + 1
2009-04-23 10:11 am
your answer is correct...
it's just substituting
it's just substituting
2009-04-23 10:06 am
fg(x)
= 5(x²) +1
= 5x² +1
you are correct
gf(x)
= (5x +1)²
= 25x² + 10x +1
you are correct also, you just forgot to expand it
= 5(x²) +1
= 5x² +1
you are correct
gf(x)
= (5x +1)²
= 25x² + 10x +1
you are correct also, you just forgot to expand it
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