Fidn the solutions to the quadratic equation: x^2 - 16 = 0
Solve by adding 16 to both sides of the equation yielding: x^2 = 16. Then take the square root of both sides (remembering that taking the square root gives us a positive and a negative answer), giving us x = +/- sqrt(16) = +/- 4. So the solution are x=+4 and x=-4.
PD
Related Maths GCSE answers
All answers ▸Factorise and solve x^2 -8x=15=0
Solve the simultaneous equations: y = 4x^2 - 9x - 1 and y = 5 - 4x
Work out (2^34) / (2^3)^10
Paul buys 12 apples and 10 oranges. 12 apples cost £6. The ratio of the cost of one apple: one orange is 2:3. What is the total cost of the apples and oranges?