The difference of the square of a number and 28 is equal to 3 times that number. Find the negative solution

Question

Mathematics

Alyson Marshall

9 June, 08:25

The difference of the square of a number and 28 is equal to 3 times that number. Find the negative solution

+5

Answers (1)

Know the Answer?

Johanna Murray · Answer 1

If the number is x, this can be written as

x² - 28 = 3x

Move the 3x

x² - 3x - 28 = 0

Factor

(x - 7) (x + 4) = 0

This means that x can be 7 or - 4, so it's x = - 4