2y(x3+9x-10x2-45) not much to be taken as a common factor
14a= 2*7*a
28ab= 2^2*7*a*b
GCF (14a,28ab)= 2*7*a= 14a
The GCF of 14a and 28ab is 14a~
Assuming you mean
(x-2)²=49
sqare root both sides and take positive and negative roots
x-2=+/-7
add 2 to both sides
x=2+/-7
x=2+7 and 2-7
x=9 and -5
