Question

find the value of x. ​

Answer 1

By expanding the determinant, we get,

6 + 7x = 20

7x = 14

x = 2 [Ans]

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Answer 2

Answer:

20=✓2*3✓2+7x

3*4+7x=20

12+7x=+-20

7x=20-12

7x=7

x=1