Question

when three times a number which is positive is subtracted from the square of that number the answer is 28.find the number??​

Answer 1

Answer:

1.94

Step-by-step explanation:

Let the number be x

So when three times a number which is positive which means when a number is x so three times a number must be 3x is subtracted from the square of that number ,

now the number 3x is subtracted from its own square i guess it should look like this

$(3x)^2-3x$

and the answer is 28 so the final form of the problem should be

$(3x)^2-3x=28$

$9x^{2} -3x-28=0$

now we solve the quadratic equation by using the quadratic formula and we two values for x

one is a positive value and the other is negative value we take the positive value as said in the question itself  "when three times a number which is positive" so that value of x is 1.94