220k views
1 vote
If two numbers have: a sum of -7 and their product is -8, then what are the two numbers?

1 Answer

3 votes
A) x + y = -7
B) x * y = -8
B) y = -8/x
A) x -8/x = -7
A) x² -8 = -7x
A) x² +7x -8 = 0
Using quadratic formula
x = [-7 +-sq root (49 +4*1*8)] / 2*1
x = [-7 +- sq root (81)] / 2
x1 = (-7 + 9) /2 = 1
x2 = (-7 -9) / 2 = -16/2 = -8



User Biggie Mac
by
8.7k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories