Answers edited by ProfLayton

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• What is the axis of symmetry and vertex for the graph #y=2x^2+4x-3#?
  
• Question #e61aa
  
• What is the equation of the line that passes through #(-1,2)# and is perpendicular to the line that passes through the following points: #(5,-3),(7,6) #?
  
• Question #85f61
  
• Solve question 39 ?
  
• How do you factor #-9r^2 + 81#?
  
• Solve question 39 ?
  
• Question #5b977
  
• Question #e61aa
  
• How do you evaluate #sin((5pi)/9)cos((7pi)/18)-cos((5pi)/9)sin((7pi)/18)#?