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galina1969 [7]
3 years ago
15

given that alpha and beta are roots of the quadratic equation ax²+bx+c=0, show that alpha+beta=-6÷a and alphabeta=c÷a​

Mathematics
1 answer:
Harman [31]3 years ago
3 0

Answer:

\alpha + \beta = -\frac{b}{a}

\alpha  \beta = \frac{c}{a}

Step-by-step explanation:

Given

ax^2 + bx + c = 0

Roots: \alpha \& \beta

Required

Show that:

\alpha + \beta = -\frac{b}{a}

\alpha \beta = \frac{c}{a}

ax^2 + bx + c = 0

Divide through by a

\frac{a}{a}x^2 + \frac{b}{a}x + \frac{c}{a} = \frac{0}{a}

x^2 + \frac{b}{a}x + \frac{c}{a} = 0

The general form of a quadratic equation is:

x^2 - (Sum)x + (Product) = 0

By comparison, we have:

-(Sum)x = \frac{b}{a}x

-(Sum) = \frac{b}{a}

Sum is calculated as:

Sum = \alpha + \beta

So, we have:

-(\alpha + \beta) = \frac{b}{a}

Divide both sides by -1

\alpha + \beta = -\frac{b}{a}

Similarly;

Product = \frac{c}{a}

Product is calculated as:

Product = \alpha * \beta

So, we have:

\alpha * \beta = \frac{c}{a}

\alpha  \beta = \frac{c}{a}

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