Mathematics, 05.10.2019 11:30 smiley0326

Which two numbers add up to 20 in multiply to -3

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Answer from: hpugh2019

X + y = 20
xy = -3
x + y = 20
x - x + y = -x + 20
y = -x + 20

xy = -3
x(-x + 20) = -3
  x(-x) + x(20) = -3
-x² + 20x = -3
-x² + 20x + 3 = 0
-1(x²) - 1(-20x) - 1(-3) = 0
-1(x² - 20x - 3) = 0
-1 -1
x² - 20x - 3 = 0
x = -(-20) ± √((-20)² - 4(1)(-3))
2(1)
x = 20 ± √(400 + 12)
  2
x = 20 ± √(412)
2
x = 20 ± 2√(103)
2
x = 10 ± √(103)
x = 10 + √(103) or x = 10 - √(103)

x + y = 20
10 + √(103) + y = 20
- (10 + √(103)) - (10 + √(103))
y = 10 - √(103)
(x, y) = (10 + √(103), 10 - √(103))

or

  x + y = 20
10 - √(103) + y = 20
- (10 - √(103)) - (10 - √(103))
y = 10 + √(103)
(x, y) = (10 - √(103), 10 + √(103))

The two numbers that add up to 20 and multiply to -3 are 10 ± √(103).

Answer from: Quest

answer: c

step-by-step explanation: because you don't have to draw a point of intersection. couldyou give me brainliest?

Iwill give brainliest plz asap. which action is not a step in using paper folding to find the midpo

Answer from: Quest

3units/ 5 feet = 60 units/ 100 feet3 units/ 5 feet = 18 units/ 30 feetthe dimensions of the scale drawing are 60 units by 18 units.hope this !

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Which two numbers add up to 20 in multiply to -3...