f(x)=\sqrt2x^2
a)
-1;2,5;19
1)
f(-1)=\sqrt2*(-1)^1=\sqrt2*1=\sqrt2
2)
f(2,5)=\sqrt2*(2,5)^2=\sqrt2*6,25=6,65\sqrt2
lub
f(2,5)=\sqrt2*(2,5)^2=\sqrt2*(\frac{25}{10})^2=\sqrt2*(\frac{5}{2})^2=\sqrt2*\frac{25}{4}=6\frac{1}{4}\sqrt2
3)
f(19)=\sqrt2*19^2=361\sqrt2
b)
1)
f(\sqrt[4]{2})=\sqrt2*(\sqrt[4]{2})^2=\sqrt2*(2^{\frac{1}{4}})^2=\sqrt2*2^{\frac{1}{2}}=\sqrt2*\sqrt2=2
2)
f(-3\sqrt2)=\sqrt2*(-3\sqrt2)^2=\sqrt2*9*2=18\sqrt2
3)
f(1-\sqrt2)=\sqrt2*(1-\sqrt2)^2=\sqrt2*(1-2\sqrt2+2)=\sqrt2-2*2+2\sqrt2=3\sqrt2-4