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Statement -1 : Let a,b,c are the sides o...

Statement -1 : Let a,b,c are the sides of a `DeltaABC` such that `|{:(a,a^2b-1,a^2+c),(b,b^3-1,b^2+c),(c,c^2b-1,c^2+c):}|=0` then triangle is isosceles.
Statement -2 : All the element of any two rows are equal then the value of the determinant is equal to zero.

A

Statement -1 is True, Statement -2 is True, Statement -2 is a correct explanation for statement-1

B

Statement -1 is true, statement-2 is true , statement-2 is NOT a correct explanation for statement-1

C

Statement-1 is true, statement -2 is False

D

Statement -1 is False, Statement -2 is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the given determinant and prove the statements regarding the triangle being isosceles and the properties of determinants. ### Step-by-Step Solution: 1. **Write Down the Determinant**: We have the determinant: \[ D = \begin{vmatrix} a & a^2b - 1 & a^2 + c \\ b & b^3 - 1 & b^2 + c \\ c & c^2b - 1 & c^2 + c \end{vmatrix} \] 2. **Assume \( a = b \)**: To check if the triangle is isosceles, we assume \( a = b \). This means we can replace \( b \) with \( a \) in the determinant: \[ D = \begin{vmatrix} a & a^2a - 1 & a^2 + c \\ a & a^3 - 1 & a^2 + c \\ c & c^2a - 1 & c^2 + c \end{vmatrix} \] 3. **Simplify the Determinant**: The first two rows of the determinant now are: - Row 1: \( (a, a^3 - 1, a^2 + c) \) - Row 2: \( (a, a^3 - 1, a^2 + c) \) Since the first two rows are identical, we can apply the property of determinants that states if two rows are the same, the determinant is zero: \[ D = 0 \] 4. **Conclusion for Statement 1**: Since we have shown that \( D = 0 \) when \( a = b \), this implies that the triangle is isosceles. Therefore, Statement 1 is true. 5. **Verify Statement 2**: Statement 2 states that if all elements of any two rows are equal, then the value of the determinant is equal to zero. This is indeed a property of determinants. Thus, Statement 2 is also true. ### Final Result: Both statements are true: - Statement 1: True (the triangle is isosceles). - Statement 2: True (property of determinants).
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FIITJEE-DETERMINANT-SOLVED PROBLEMS (OBJECTIVE)
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  11. Consider the determinant, Delta=|(p,q,r),(x,y,z),(l,m,n)| . M(ij) d...

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  12. Consider the determinant, Delta=|(p,q,r),(x,y,z),(l,m,n)| . M(ij) d...

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  13. Statement -1 : Let a,b,c are the sides of a DeltaABC such that |{:(a,a...

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  20. Which of the following options is the only correct combination ?

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