Mathematics, 27.02.2021 02:10 candlelight45

Ben says that n=5 is the solution of the equation 7n=45. How can you check whether Ben is correct? Please give details and explain.

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(fog)(x) if f(x)=x^2- 4 and g(x)=x^2 + 2 x, f(g(x))= f(x^2+2x) (x^2+2x)^2-4 (x^2+2x)(x^2+2x)-4 (x^4+2x^3+5x+4x^2)-4 x^4+2x^3+4x^2+5x-4 what am i doing wrong

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