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प्रश्न
Which equation below represents a parabola that opens upward with a vertex at (0, – 5)?
विकल्प
y = x2 + 5
y = x2 – 5
y = (x – 5)2
y = (x + 5)2
MCQ
उत्तर
y = x2 + 5
Explanation:
(a) y = x2 + 5 ⇒ – 5 = (0)2 + 5 ⇒ – 5 ≠ 5
∴ It is not correct.
(b) y = x2 – 5 ⇒ – 5 = (0)2 – 5 ⇒ – 5 = – 5
∴ It is correct.
(c) y = (x – 5)2 ⇒ – 5 = (0 – 5)2 ⇒ – 5 ≠ 25
∴ It is not correct.
(d) y = (x + 5)2 ⇒ – 5 = (0 + 5)2 ⇒ – 5 ≠ 25
∴ It is not correct.
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