Mathematics, 06.01.2020 04:31 Melleeroo

What two numbers add to 15 and multiply to negative 312?

Answers: 2

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Answer from: bravoy

X + y = 15
xy = -312

x + y = 15
x - x + y = -x + 15
y = -x + 15

xy = -312
x(-x + 15) = -312
x(-x) + x(15) = -312
-x² + 15x = -312
-x² + 15x + 312 = 0
-1(x²) - 1(-15x) - 1(312) = 0
-1(x² - 15x + 312) = 0
  -1     -1
x² - 15x + 312 = 0
x = -(-15) ± √((-15)² - 4(1)(312))
2(1)
x = 15 ± √(225 - 1248)
2
x = 15 ± √(-1023)
2
x = 15 ± 31.984i
2
x = 7.5 ± 15.992
x = 7.5 + 15.992 or x = 7.5 - 15.992
x = 23.492     or      x = -8.492

  x + y = 15
23.492 + y = 15
- 23.492 - 23.492
y = -8.492
(x, y) = (23.492, -8.492)

or

  x + y = 15
-8.492 + y = 15
+ 8.492   + 8.492
y = 23.492
(x, y) = (-8.492, 23.492)

The two numbers that add up to 15 and mutliply to -312 are -8.492 and 23.492.

Answer from: Quest

False because how does that work?

Answer from: Quest

Absolute value graph shifted point 5 up

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