Question

Fungsi f : x ⇒ k - x². Jika f(9) = 63, maka nilai dari √k =

Answer 1

F(x)=k-x^2
f(9)=63
63=k-9^2
63=k-81
k=63+81
k=144
sqrt(k)=12

Answer 2

F(x) = k-x²
f(9) = k-(9)² = 63
     = k-81 =63 , k=144 maka √144 = 12