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Show that the sum of roots of a quadratic equation `ax^(2) + bx + c = 0 "is" (-b)/a`

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The roots of a quadratic equation ax^(2) + bx + c = 0 "is"

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BEYOND PUBLICATION-QUADRATIC EQUATIONS-EXAMPLE
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  18. Find the roots of the following quadratic equations by factorisation ...

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  19. Find two numbers whose sum is 10 and product is 24.

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