Algebra - Inequalities & Modulus - Previous Year IPM/BBA Questions
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The set of all real values of x satisfying the inequality .
- (a)
(-1, -1/2) ∪ (0, ∞)
- (b)
(-1, -1/2) ∪ (1, ∞)
- (c)
(-1, 0) ∪ (1, ∞)
- (d)
(-∞, -1) ∪ (-1/2, 0) ∪ (1, ∞)
Answer: Option B
Text Explanation :
Workspace:
The sum of the squares of all the roots of the equation x2 + |x + 4| + |x − 4| − 35 = 0 is
- (a)
74
- (b)
175
- (c)
50
- (d)
148
Answer: Option C
Text Explanation :
Given, x2 + |x + 4| + |x − 4| − 35 = 0
Here the critical points are -4 and 4.
Case 1: x ≥ 4
∴ x2 + (x + 4) + (x − 4) − 35 = 0
⇒ x2 + 2x - 35 = 0
⇒ (x + 7)(x - 5) = 0
⇒ x = - 7 or 5
Since x ≥ 4, hence x = -7 is rejected.
∴ x = 5
Case 2: - 4 ≤ x < 4
∴ x2 + (x + 4) - (x − 4) − 35 = 0
⇒ x2 - 17 = 0
⇒ x2 = 17
⇒ x = ±√17
Both these values are rejected since -4 ≤ x < 4.
Case 3: x < - 4
∴ x2 - (x + 4) - (x − 4) − 35 = 0
⇒ x2 - 2x - 35 = 0
⇒ (x - 7)(x + 5) = 0
⇒ x = -5 [Since x < -4]
∴ Possible solutions are 5 and -5
∴ Sum of squares of solutions = 25 + 25 = 50.
Hence, option (c).
Workspace:
The minimum value of f(x) = |3 - x| + |2 + x| + |5 - x| is equal to __________.
Answer: 7
Text Explanation :
Given, |3 - x| + |2 + x| + |5 - x|
= |x - 3| + |x + 2| + |x - 5|
= |x + 2| + |x - 3| + |x - 5|
Here, the critical points are -2, 3 and 5.
The minimum possible value of |x + 2| + |x - 5| is when x is between -2 and 5.
The minimum possible value of |x - 3| is when x = 3.
∴ x = 3 minimises |x + 2| + |x - 3| + |x - 5|.
⇒ Minimum value of |x + 2| + |x - 3| + |x - 5| = |3 + 2| + |3 - 3| + |3 - 5|
= 5 + 0 + 2 = 7
Hence, 7.
Workspace:
Consider the following statements:
(i) When 0 < x < 1, then < 1 - x + x2
(ii) When 0 < x < 1, then > 1 - x + x2
(iii) When -1 < x < 0, then < 1 - x + x2
(iv) When -1 < x < 0, then > 1 - x + x2
Then the correct statements are
- (a)
(i) and (ii)
- (b)
(ii) and (iv)
- (c)
(i) and (iv)
- (d)
(ii) and (iii)
Answer: Option C
Text Explanation :
When 0 < x < 1, consider and 1 - x + x2
Let us take x = 0.5
∴ = 0.67 and 1 - x + x2 = 1 - 0.5 + 0.25 = 0.75
⇒ < 1 - x + x2
∴ (i) is correct.
When 0 < x < 1, consider and 1 - x + x2
Let us take x = -0.5
∴ = 2 and 1 - x + x2 = 1 + 0.5 + 0.25 = 1.75
⇒ > 1 - x + x2
∴ (iv) is correct.
Hence, option (d).
Workspace:
If |x| < 100 and |y| < 100, then the number of integer solutions of (x, y) satisfying the equation 4x + 7y = 3 is
Answer: 29
Text Explanation :
Workspace:
If x ∈ (a, b) satisfies the inequality ≥ 1, then the largest possible value of b - a is
- (a)
3
- (b)
1
- (c)
2
- (d)
No real values of x satisfies the inequality
Answer: Option B
Text Explanation :
Workspace:
The set of values of x which satisfy the inequality < 0.343 is
- (a)
(1/2, 1)
- (b)
(1/2, ∞)
- (c)
(-∞, 1/2)
- (d)
(-∞, 1/2) ∪ (1, ∞)
Answer: Option D
Text Explanation :
Workspace:
For a > b > c > 0, the minimum value of the function f(x) = |x - a| + |x - b| + |x - c| is
- (a)
2a- b - c
- (b)
a + b - 2c
- (c)
a + b + c
- (d)
a - c
Answer: Option D
Text Explanation :
Workspace:
The inequality logaf(x) < logag(x) implies that
- (a)
f(x) > g(x) > 0 for 0 < a < 1 and g(x) > f(x) > 0 for a > 1
- (b)
g(x) > f(x) > 0 for 0 < a < 1 and f(x) > g(x) > 0 for a > 1
- (c)
f(x) > g(x) > 0 for a > 0
- (d)
g(x) > f(x) > 0 for a > 0
Answer: Option A
Text Explanation :
Workspace: