1.
a. (x-4)(x+4)
b. (y-7)(y+7)
c. (2a-1)(2a+1)
d. (5x-y)(5x+y)
e. (4x-5)(4x+5)
f. (9x-7y)(9x+7y)
g. (1,3a-1,2b)(1,3a+1,2b)
h. (1-1,4xy)(1+1,4xy)
2.
a. (x-rad2)(x+rad2)
b. (y-rad3)(y+rad3)
c. (ab-rad7)(ab+rad7)
d. [(rad2)*a-rad5][(rad2)*2+rad5]
e. [(rad3)*x-(rad2)*y][(rad3)*x+(rad2)*y]
4. (a^2-b^2)(a^2+b^2)
(4x^2-1)(4x^2+1)
(x^2y^2-9)(x^2y^2+9)
(a^2-2)(a^2+2)
[(x-1)^2-4][(x-1)^2+4)
3.
(xrady-11rady)(xrady+11rady)
(1,5xz-yz)(1,5xz+yz)
(1/2*xa-1/12)(1/2*xa+1/12)
(11aradx-2/3bradx)(11aradx+2/3bradx)
(2xy-rad3*y)(2xy+rad3*y)
[rad (2a)-rada][rad (2a)+rada]
