In the given question, two equations numbered I and II are given. Solve both the equations and mark the appropriate answer.
I. x2 + 2x – 8 = 0
II. y2 – 8y + 12 = 0
- AOption (a)
x > y
- BOption (b)
x < y
- COption (c)
x ≥ y
- DOption (d)
x ≤ y
- EOption (e)
x = y or relationship between x and y cannot be established
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Correct answer
x ≤ y
Why this answer is correct
Calculation:
From I,
x2 + 2x – 8 = 0
⇒ x2 + 4x – 2x - 8 = 0
⇒ x(x + 4) – 2(x + 4) = 0
⇒ (x + 4)(x – 2) = 0
⇒ x = -4, 2
From II,
y2 – 8y + 12 = 0
⇒ y2 – 2y – 6y + 12 = 0
⇒ y(y – 2) – 6(y – 2) = 0
⇒ (y – 2)(y – 6) = 0
⇒ y = 2, 6
Comparison between x and y (via Tabulation):
| Value of x | Value of y | Relation |
|---|---|---|
| -4 | 2 | x < y |
| -4 | 6 | x < y |
| 2 | 2 | x = y |
| 2 | 6 | x < y |
∴ x ≤ y