Resposta:
Explicação passo-a-passo:
f(-3) = (-3)² - 2(-3) - 10 = 9 + 6 - 10 = 5
x² - 2x - 10 = 0
[tex]\delta=(-2)²-4.1.(-10)=4+40=44[/tex]
x = [tex]\frac{2+ou-\sqrt{44}}{2.1}[/tex]
[tex]x_{1}\frac{2+2\sqrt{11}}{2}=>x_{1}=\frac{2(1+\sqrt{11})}{2}=>x_{1}=1+\sqrt{11}[/tex]
[tex]x_{2}\frac{2-2\sqrt{11}}{2}=>x_{2}=\frac{2(1-\sqrt{11})}{2}=>x_{2}=1-\sqrt{11}[/tex]
