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40 votes
40 votes
Determine a quadratic equation, in standard form, that has the pair of root: x=-3, x=5

User Marknery
by
2.9k points

2 Answers

16 votes
16 votes

Answer:

x²-2x-15=0

Explanation:

x=-3 x=5

x+3=0 x-5=0

(x+3)(x-5)=0

x²-5x+3x-15=0

x²-2x-15=0

User Simon Guo
by
3.4k points
22 votes
22 votes

Answer:


x^2 -2x -15=0

Explanation:


\text{Given that, the roots are,}~ \alpha=-3 ~ \text{and}~ \beta=5 .\\\\\text{The quadratic equation with roots}~ \alpha ~ \text{and}~ \beta ~ \text{is,}\\\\~~~~~~~~x^2 - (\alpha + \beta )x +\alpha \beta = 0\\\\\implies x^2-(-3 +5) x +(-3)(5) = 0\\\\\implies x^2 -2x -15=0

User Delcenia
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3.1k points