1. Solving functions

Given
f(x) = xsquared
g(x) = 2x + 3

Solve fg(x) = f(x)

2. f(g(x))=(2x+3)^2=x^2=f(x)

4x^2+12x+9=x^2

3x^2+12x+9=0

x^2+4x+3=0

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3. Thanks I understand up to 3x^2+12x+9=0 but don't understand why you wrote x^2+4x+3=0 afterwards?

4. Originally Posted by Natasha1
Thanks I understand up to 3x^2+12x+9=0 but don't understand why you wrote x^2+4x+3=0 afterwards?
I divided all by 3...

5. Oh yes of course thanks!