Question

What is the sum of all positive values of x such that x^2 + 6x - 91 = 0?

Answer 1

Answer:

20

Step-by-step explanation:

x^2 + 6x - 91 = 0

or, x^2 + 13x - 7x -91=0

or, x(x-13) -7(x-13) =0

or, (x-13)(x-7)= 0

either,

x-13=0 ==> X= 13

x-7=0 ==> X = 7

sum of all positive values of x = 13 +7 = 20