Question

the square of the number is 60 more than 7 times the number. find the number ​

Answer 1

Correct question :-

• The square of a negative number is 60 more than four times the negative number find the number.

Answer :-

Let x be the unknown negative number.

The square of the negative number: x²

is = 60 more than 4 times the negative number: 4x + 60

x² = 4x + 60

x² - 4x - 60 = 0

Factors to:

(x-10)(x+6) = 0

x = 10 and -6

Since the number is negative, x = -6

Check:

x² = 4x + 60

(-6)² = 4(-6)+60

36 = -24 + 60

36 = 36

Check!