Find x for: x^2 + 5x = 5
x2 + 5x = 5 Make equal to 0. x2 +5x - 5 = 0 Recognise that you need to use the quadratic equation. (-b ± sqrt(b2-4ac))/2 sub in. (-5 ± sqrt(52-41-5))/2 (-5 ± sqrt(45))/2 x = (-5 + 6.7)/2, x = (-5 - 6.7)/2 x = 0.85, x = -5.85
x2 + 5x = 5 Make equal to 0. x2 +5x - 5 = 0 Recognise that you need to use the quadratic equation. (-b ± sqrt(b2-4ac))/2 sub in. (-5 ± sqrt(52-41-5))/2 (-5 ± sqrt(45))/2 x = (-5 + 6.7)/2, x = (-5 - 6.7)/2 x = 0.85, x = -5.85
