Question

what two numbers multiply to -15 and add to -1

Answer 1

Step-by-step explanation:

Let the two numbers be x and y

so, x X y = -15

x = -15/y

and x + y = -1

Substitute the value of x

so, -15/y + y = -1

-15+ y^2 = -y

y^2 + y - 15 = 0

y = ( -1 + √61 )/2 , ( -1 - √61 )/2

so, x = -15/y = 30/( -1 + √61 ) , 30/( -1 - √61 )