Find roots of polynomial $$ p(x) = 1-\frac{7}{10}x-\frac{3}{10}x^2 $$
Answer
The roots of polynomial $ p(x) $ are:
$$ \begin{aligned}x_1 &= 1\\[1 em]x_2 &= -\frac{ 10 }{ 3 } \end{aligned} $$Explanation
Step 1:
Get rid of fractions by multipling equation by $ \color{blue}{ 10 } $.
$$ \begin{aligned} 1-\frac{7}{10}x-\frac{3}{10}x^2 & = 0 ~~~ / \cdot \color{blue}{ 10 } \\[1 em] 10-7x-3x^2 & = 0 \end{aligned} $$Step 2:
Write polynomial in descending order
$$ \begin{aligned} 10-7x-3x^2 & = 0\\[1 em] -3x^2-7x+10 & = 0 \end{aligned} $$Step 3:
The solutions of $ -3x^2-7x+10 = 0 $ are: $ x = -\dfrac{ 10 }{ 3 } ~ \text{and} ~ x = 1$.
You can use step-by-step quadratic equation solver to see a detailed explanation on how to solve this quadratic equation.
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