Uh-Oh! That’s all you get for now. We would love to personalise your learning journey. Sign Up to explore more. Sign Up or Login Skip for now Uh-Oh! That’s all you get for now. We would love to personalise your learning journey. Sign Up to explore more. Sign Up or Login Skip for now Solve the quadratic equation x2 - 3(x + 3) = 0; Give your answer correct two significant figures x2 - 3(x + 3) = 0 `=> x^2 - 3x - 9 = 0` Comparing with `ax^2 + by + c` we get `:. x = (-b+-sqrt(b^2 - 4ac))/(2a)` `=> x = (-(-3)+- sqrt((-3)^2 - 4(1)(-9)))/(2(1))` `=> x = (3+- sqrt(9+36))/2` `=> x = (3+- sqrt45)/2` `=> x = (3+- sqrt(9xx5))/2` `=> x = (3+-3sqrt5)/2` `=> x = (3+3sqrt5)/2 or x = (3-3sqrt5)/2` `=> x = (3+3xx2.236)/2 or x = (3-3xx2.236)/2` `=> x = (3+6.708)/2 or x = (3-6.708)/2` `=> x = 9.708/2 or x = (-3.708)/2` `=>` x = 4.85 or x = -1.85 `=>` x = 4.9 or x = -1.9 Concept: Quadratic Equations Is there an error in this question or solution? |