Give exact and approx to three decimal places
I shall do this with two methods as I am not sure which you are familiar with.
x^2 + 12x + 36 = 64
x^2 + 12x + 36 - 64 = 0
x^2 + 12x - 28 = 0
Method 1 Factorise to get
(x - 2)(x + 14)=0
x - 2 = 0 and x + 14 = 0
A quadratic equation is solved using two methods. The solution is detailed and well presented.