Find two integers whose sum is - 7 and whose product is 12. Explain how you found the numbers.

Question

Mathematics

Orlando Stevenson

8 October, 10:14

Find two integers whose sum is - 7 and whose product is 12. Explain how you found the numbers.

+4

Answers (2)

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Bridget Underwood · Answer 1

Hello : let x, y this numbers

x+y = - 7 ... (1)

xy = 12 ... (2)

by (1):

y = - 7 - x

subsct in (2):

x (-7 - x) = 12

-7x - x² = 12

x² + 7x + 12 = 0

(x+4) (x + 3) = 0

x+4 = 0 or x+3 = 0

so : x = - 4 or x = - 3

Victoria Craig · Answer 2

-3 + (-4) = - 7

-3 times - 4=12

negative plus a negative is still a negative. negative times a negative is a positive.