If the square of a number is added to 8 times the number, the result is 100.

Let's take the number as 'x'.

We are given that, 8x + x² = 100

Now, let's solve for x.

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Quadratic equations such as this one can be solved by completing the square. In order to complete the square, the equation must first be in the form x²+bx=c.

Divide 8, the coefficient of the x term, by 2 to get 4. Then add the square of 4 to both sides of the equation. This step makes the left-hand side of the equation a perfect square.

Square 4.

Add 100 to 16.

Factor x²+8x+16. In general, when x²+bx+c is a perfect square, it can always be factored as .

Take the square root of both sides of the equation.

Simplify.

Subtract 4 from both sides of the equation.

lockers 1, 4, 9, 16, 25, 40, and 49 are open

i ran through it by the other answer is wrong

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column