Step-by-step explanation: According to the pythagorean theorem, which states A² + B² = C². This means that in this equation 5²+12²=x². When we solve this we get 169=x². Since 169 is the perfect square of 13 therefore the answer is 13.
F(g(x)) means you take the g function and put it into x in the f function. He took the function and put it into the g, which was the incorrect order. He should have had this:
Longitud = L Ancho = A 2A + 2L = 54 L = 2A Sustituir este valor por L en la primera ecuación: 2A + 2(2A) = 54 2A + 4A = 54 6A = 54 A = 9 También porque L = 2A, L = 2(9) = 18
