Question

*In Cramer’s method, Dx = 12, x= 3 then D = ?*

1️⃣ 36
2️⃣ 4
3️⃣ 9
4️⃣ 15​

Answer 1

Answer:

Dx = 12

Putting x = 3, we get

3D = 12

D = 12/3

(D = 4) Ans

Answer 2

SOLUTION

TO CHOOSE THE CORRECT OPTION

$\sf{In \: Cramer’s \: method, \: D_x = 12, \: x= 3 \: then \: D = }$

1. 36

2. 4

3. 9

4. 15

EVALUATION

Here it is given that

$\sf{D_x = 12, \: x= 3 \: }$

Now using Cramer's rule we get

$\displaystyle \sf x = \frac{D_x}{D}$

$\displaystyle \sf \implies \: 3 = \frac{12}{D}$

$\displaystyle \sf \implies \: D = \frac{12}{3}$

$\displaystyle \sf \implies \: D = 4$

FINAL ANSWER

Hence the correct option is 2. 4

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