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Which is the x-value of the solution of the system of equations? y=3x^2+15 y=5x^2-17

A. x=±1 B. x=±2
C. x=±4 D. x=±16

Sagot :

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Answer:

C. x = ±4

Explanation:

Given two equation's:

  1. y = 3x² + 15
  2. y = 5x² - 17

Solve them simultaneously:

 y       =       y

3x² + 15 = 5x² - 17

5x² - 3x² = 15 + 17

2x² = 32

x² = 16

x = ±√16

x = ±4

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