Asked by night
A number is 8 more than another number.If the product of the two numbers is 20.Find the numbers.
Answers
Answered by
Reiny
Easy to figure out by looking at the factors of 20
1x20
2x10
4x5
which have a difference of 8 ??
formal way:
let one number be x
let the other be x+8
x(x+8) = 20
x^2 + 8x - 20 = 0
(x+10)(x-2) = 0
x = -10 or x = 2
if x = 2, the numbers are 2 and 10
if x = -10, the number are -10 and -2
1x20
2x10
4x5
which have a difference of 8 ??
formal way:
let one number be x
let the other be x+8
x(x+8) = 20
x^2 + 8x - 20 = 0
(x+10)(x-2) = 0
x = -10 or x = 2
if x = 2, the numbers are 2 and 10
if x = -10, the number are -10 and -2
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