The quadratic equation with roots –1 and 4 is
2023
The quadratic equation with roots –1 and 4 is
- A.
x2−3x−4=0
- B.
x2+3x+3=0
- C.
x2−4x+1=0
- D.
More than one of the above
- E.
None of the above
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Correct answer: A
To find the quadratic equation with given roots, use the fact that for roots α and β, the equation is x² - (α+β)x + αβ = 0.
Here, the roots are -1 and 4.
Sum of roots = -1 + 4 = 3
Product of roots = (-1) × 4 = -4
So, the quadratic equation is x² - 3x - 4 = 0.
This matches option A.
हिन्दी उत्तर:
द्विघात समीकरण के मूल दिए गए हैं, तो वह समीकरण x² - (मूलों का योग)x + (मूलों का गुणनफल) = 0 के रूप में होता है।
यहाँ मूल -1 और 4 हैं।
मूलों का योग = -1 + 4 = 3
मूलों का गुणनफल = (-1) × 4 = -4
इसलिए, द्विघात समीकरण x² - 3x - 4 = 0 है।
यह विकल्प A से मेल खाता है।
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