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2x^(2) +12x-7=0 \\ give your answer to 2 decimal places
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2x^(2) +12x-7=0 \\ give your answer to 2 decimal places

User PatrickJ
by
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1 Answer

7 votes

Answer:

-2. 46

- 9.54

Explanation:

  • 2x²+12x-7=0
  • 2x²+12x+18= 25
  • 2*(x²+6x+9)=25
  • 2*(x+6)²= 5²
  • x+6= 5√2/2 ⇒ x= 5√2/2 -6 ≈ -2. 46
  • x+6= -5√2/2 ⇒ x= -5√2/2 -6 ≈ - 9.54
User Lillian
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