seja f a função Z em Z defenida por f(x)=x^2-3x-2 calcule:
a)f(2),
b)f(-1)
c)raiz quadrada de 3,
d)(1/2)
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Solução!
![A)~~\\\\
f(x)= x^{2} -3x-2\\\\\\
f(2)=(2)^{2}-3(2)-2\\\\\\\
f(2)=4-6-2\\\\\\\
\boxed{f(2)=-4}\\\\\\\\
B)~~\\\\
f(x)= x^{2} -3x-2\\\\\\\\
f(-1)= (-1)^{2} -3(-1)-2\\\\\\\
f(-1)=1 +3-2\\\\\\\
f(-1)=4-2\\\\\\\
\boxed{f(-1)=2}\\\\\\\](https://tex.z-dn.net/?f=A%29%7E%7E%5C%5C%5C%5C%0Af%28x%29%3D+x%5E%7B2%7D+-3x-2%5C%5C%5C%5C%5C%5C%0Af%282%29%3D%282%29%5E%7B2%7D-3%282%29-2%5C%5C%5C%5C%5C%5C%5C%0A+f%282%29%3D4-6-2%5C%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bf%282%29%3D-4%7D%5C%5C%5C%5C%5C%5C%5C%5C%0AB%29%7E%7E%5C%5C%5C%5C%0Af%28x%29%3D+x%5E%7B2%7D+-3x-2%5C%5C%5C%5C%5C%5C%5C%5C%0Af%28-1%29%3D+%28-1%29%5E%7B2%7D+-3%28-1%29-2%5C%5C%5C%5C%5C%5C%5C%0Af%28-1%29%3D1+%2B3-2%5C%5C%5C%5C%5C%5C%5C%0Af%28-1%29%3D4-2%5C%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bf%28-1%29%3D2%7D%5C%5C%5C%5C%5C%5C%5C%0A "A)~~\\\\
f(x)= x^{2} -3x-2\\\\\\
f(2)=(2)^{2}-3(2)-2\\\\\\\
f(2)=4-6-2\\\\\\\
\boxed{f(2)=-4}\\\\\\\\
B)~~\\\\
f(x)= x^{2} -3x-2\\\\\\\\
f(-1)= (-1)^{2} -3(-1)-2\\\\\\\
f(-1)=1 +3-2\\\\\\\
f(-1)=4-2\\\\\\\
\boxed{f(-1)=2}\\\\\\\")
![c)~~\\\\\
f(x)= x^{2} -3x-2\\\\\\
f( \sqrt{3} )= ( \sqrt{3}) ^{2} -3( \sqrt{3}) -2\\\\\\
f( \sqrt{3} )= 3 -3( \sqrt{3}) -2\\\\\\
f( \sqrt{3} )= 3-2 -3( \sqrt{3}) \\\\\\
\boxed{f( \sqrt{3} )= 1 -3( \sqrt{3})} \\\\\\
Ou\\\\
f( \sqrt{3} )= 1 -3(1,73) \\\\\\
f( \sqrt{3} )= 1 -5,19 \\\\\\
\boxed{f( \sqrt{3} )= -4,19} \\\\\\](https://tex.z-dn.net/?f=c%29%7E%7E%5C%5C%5C%5C%5C%0Af%28x%29%3D+x%5E%7B2%7D+-3x-2%5C%5C%5C%5C%5C%5C%0Af%28+%5Csqrt%7B3%7D+%29%3D+%28+%5Csqrt%7B3%7D%29+%5E%7B2%7D+-3%28+%5Csqrt%7B3%7D%29+-2%5C%5C%5C%5C%5C%5C%0Af%28+%5Csqrt%7B3%7D+%29%3D+3+-3%28+%5Csqrt%7B3%7D%29+-2%5C%5C%5C%5C%5C%5C%0Af%28+%5Csqrt%7B3%7D+%29%3D+3-2+-3%28+%5Csqrt%7B3%7D%29+%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bf%28+%5Csqrt%7B3%7D+%29%3D+1+-3%28+%5Csqrt%7B3%7D%29%7D+%5C%5C%5C%5C%5C%5C%0AOu%5C%5C%5C%5C%0Af%28+%5Csqrt%7B3%7D+%29%3D+1+-3%281%2C73%29+%5C%5C%5C%5C%5C%5C%0Af%28+%5Csqrt%7B3%7D+%29%3D+1+-5%2C19+%5C%5C%5C%5C%5C%5C%0A%5Cboxed%7Bf%28+%5Csqrt%7B3%7D+%29%3D+-4%2C19%7D+%5C%5C%5C%5C%5C%5C "c)~~\\\\\
f(x)= x^{2} -3x-2\\\\\\
f( \sqrt{3} )= ( \sqrt{3}) ^{2} -3( \sqrt{3}) -2\\\\\\
f( \sqrt{3} )= 3 -3( \sqrt{3}) -2\\\\\\
f( \sqrt{3} )= 3-2 -3( \sqrt{3}) \\\\\\
\boxed{f( \sqrt{3} )= 1 -3( \sqrt{3})} \\\\\\
Ou\\\\
f( \sqrt{3} )= 1 -3(1,73) \\\\\\
f( \sqrt{3} )= 1 -5,19 \\\\\\
\boxed{f( \sqrt{3} )= -4,19} \\\\\\")
Bom dia!
Bons estudos!
Solução!
Bom dia!
Bons estudos!
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