Show x^2 + 8x +15 = 0 in the form of (x+b)^2 +c (complete the square) and then solve the equation
x2+8x +15 = 0
(x+4)2-16 +15=0
(x+4)2-1=0
(x+4)= (+/-)1
x = -3 or -5
OA
Related Maths GCSE answers
All answers ▸-3<n<1 n is an integer, write down all the possible values of n.
Solve the following simultaneous equations: 4x + 5y = -8 and 6x-2y = 26
How do you factorise a quadratic equation into the form (x+A)(x+B), for example x²+x-6 =0?
Solve the simultaneous equations: (1) x^2 + y^2 = 25 and (2) y - 3x = 13