Answer:
38
Step-by-step explanation:
2(l + b)
2(10 + 9)
2(19)
2*19
38
1/4 is the least, 1/2 is next, then 5/8 as the greatest.
• The value of the discriminant ,D= -16
,
• The solution to the quadratic equation is
![x=\frac{1+2i}{5}\text{ or }\frac{1-2i}{5}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B1%2B2i%7D%7B5%7D%5Ctext%7B%20%20%20%20%20or%20%20%20%20%7D%5Cfrac%7B1-2i%7D%7B5%7D)
Step - by - Step Explanation
What to find?
• The discriminant d= b² - 4ac
,
• The solution to the quadratic equation.
Given:
5x² - 2x + 1=0
Comparing the given equation with the general form of the quadratic equation ax² + bx + c=0
a=5 b=-2 and c=1
Uisng the quadratic formula to solve;
![x=\frac{-b\pm\sqrt[]{b^2-4ac}}{2a}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-b%5Cpm%5Csqrt%5B%5D%7Bb%5E2-4ac%7D%7D%7B2a%7D)
The discriminant D=b² - 4ac
Substitute the values into the discriminant formula and simplify.
D = (-2)² - 4(5)(1)
D = 4 - 20
D = -16
We can now proceed to find the solution of the quadratic equation by substituting into the quadratic formula;
![x=\frac{-(-2)\pm\sqrt[]{-16}}{2(5)}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-%28-2%29%5Cpm%5Csqrt%5B%5D%7B-16%7D%7D%7B2%285%29%7D)
Note that:
√-1 = i
![x=\frac{2\pm\sqrt[]{16\times-1}}{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B2%5Cpm%5Csqrt%5B%5D%7B16%5Ctimes-1%7D%7D%7B10%7D)
![x=\frac{2\pm\sqrt[]{16}\times\sqrt[]{-1}}{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B2%5Cpm%5Csqrt%5B%5D%7B16%7D%5Ctimes%5Csqrt%5B%5D%7B-1%7D%7D%7B10%7D)
![x=\frac{2\pm4i}{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B2%5Cpm4i%7D%7B10%7D)
![x=\frac{2}{10}\pm\frac{4i}{10}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B2%7D%7B10%7D%5Cpm%5Cfrac%7B4i%7D%7B10%7D)
![x=\frac{1}{5}\pm\frac{2}{5}i](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B1%7D%7B5%7D%5Cpm%5Cfrac%7B2%7D%7B5%7Di)
![x=\frac{1\pm2i}{5}](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B1%5Cpm2i%7D%7B5%7D)
That is;