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Maths Functions Question?
When f(x)=x^2 and g(x)=2x+3 with f and g defined on a suitable domain, if f(g(k))=49 then find the values of k.
1 Answer
- 9 years agoFavorite Answer
K=2 or -5
The answer is 2 because if you plug 2(K) into the equation g(x)=2x+3 you will get an answer of 7. After that if you plug 7(g) into the equation f(x)=x^2 you will get an answer of 49 because 7^2 (7x7) = 49.
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The answer is -5 because if you plug -5(K) into the equation g(x)=2x+3 you will get -7. And lastly if you plug -7(g) into the equation f(x)=x^2 you will get 49 because -7^2(-7x-7) = 49.