What 2 numbers, that when multiplied give you 24 but when added give you 5

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03-03-2016
Mathematics

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What 2 numbers, that when multiplied give you 24 but when added give you 5

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What value of x makes the equation true ? 4(2x-4)=16

meerkat18 meerkat18 · Answer 1 · 2016-03-07T05:45:38+01:00

meerkat18 meerkat18

07-03-2016

Let x and y be the unknown numbers.

x + y = 5
xy = 24

x + y = 5
y = 5-x

xy = 24
x(5-x) = 24
5x - x² = 24

- x² + 5x -24 = 0

(a + √a² - 4b)/2

(5 + √5² - 4(-24))/2
(5 + √25 + 96)/2
(5 + √121)/2

(5 + 11)/2 ; (5 - 11)/2
16/2 -6/2
8 ; -3

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