# X2 +14x-15=0 in this equation which add LHS as a perfect square 49. how this 49 will come... please tell about 49??? how this calculated

##### 1 Answer

May 7, 2018

x = 1, and x = - 15

#### Explanation:

There are 2 real roots:

a. x1 = - 7 + 8 = 1

b. x2 = -7 - 8 = - 15

Note.

Because a + b + c = 0, we use the shortcut.

One real root is x1 = 1, and the other is