Question

xsq -x-72 solve by completing squre method​

Answer 1

Step-by-step explanation:

x^2 - X - 72 = 0

x^2 -2*x *1/2 -72 =0

x^2 - 2*X*1/2 + (1/2) ^2 - (1/2) ^2 -72 = 0

(x-1/2)^2 = 72 +1/4

( x-1/2)^2 = 288+1/4

( x-1/2)^2 = 289/4

(x-1/2) = √ 289/4= +-17/2

X = 17/2+1/2 = 18/2 =9

X= -17/2+1/2 = -16/2 = -8