Question

The product of two numbers is 84 and their sum is 20 find the numbers?

Answer 1

Answer:

14 and 6

Step-by-step explanation:

a+b=20 , thus b=20-a

a*b=a*(20-a)=84 , thus -a^2+20a-84=0

then use the quadratic eqn:

a=[20+/-sqrt(400-336)]/2

thus a=10+/-4

so a=14 and 6

Answer 2

The two numbers are 16 and 4 .