Question

which mathematical sign will replace * mark if x=3 is a solution of the equation 3x* 2=7

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Answer 1

Answer:

Negative Sign( - )

Step-by-step explanation:

Replacing * with - we observe the following

3x - 2 = 7

As we are given that x = 3

Therefore placing it as such yields

3 x 3 - 2 = 7

9 - 2 = 7

7 = 7

As both sides are equal

Hence we can prove that the Negative sign must come in place.

Answer 2

Given,

x = 3

3x* 2=7

To find,

The mathematical sign in place of *.

Solution,

The mathematical sign in place of * will be - (minus).

We can easily solve this problem by following the given steps.

According to the question,

We have the following expression:

3x* 2=7

And we have x = 3.

Now, putting the value of x to be 3,

3(3)*2 = 7

9*2 = 7

Now, by observing the above expression we can find out that 7 can only be obtained by subtracting 2 from 9. (You can not obtain 7 by adding 9 and 2.)

(9-2) = 7

7 = 7

Hence, the mathematical sign in place of * is - (minus).