Who could help me please and thank you

Let the number is x.

According to the question:  

4 times of x will be 4x  

5 less of the square of that number will be x² -5

Therefore,

4x = x² – 5  

Make this equation in the form of a quadratic equation

x² - 4x -5 = 0    

(x - 5) (x + 1) = 0,    

The value of x = 5, and x = -1  

The negative value of x of two solutions is -1.

Step-by-step explanation:

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870