Answer Key 7.6

$(x^2-4y^2)(x^2+4y^2)$
$(x-2y)(x+2y)(x^2+4y^2)$
$(4x^2-9y^2)(4x^2+9y^2)$
$(2x-3y)(2x+3y)(4x^2+9y^2)$
$(x^2-16y^2)(x^2+16y^2)$
$(x-4y)(x+4y)(x^2+16y^2)$
$(25x^2-9y^2)(25x^2+9y^2)$
$(5x-3y)(5x+3y)(25x^2+9y^2)$
$(9x^2-4y^2)(9x^2+4y^2)$
$(3x+2y)(3x-2y)(9x^2+4y^2)$
$(x^2-9y^2)(x^2+9y^2)$
$(x-3y)(x+3y)(x^2+9y^2)$
$(25x^2-16y^2)(25x^2+16y^2)$
$(5x-4y)(5x+4y)(25x^2+16y^2)$
$(x^2-9y^2)(x^2+9y^2)$
$(x-3y)(x+3y)(x^2+9y^2)$
$(x^3-y^3)(x^3+y^3)$
$(x-y)(x^2+xy+y^2)(x+y)(x^2-xy+y^2)$
$(x^2)^3+(y^2)^3$
$(x^2+y^2)(x^4-x^2y^2+y^4)$
$(x^3-8y^3)(x^3+8y^3)$
$(x-2y)(x^2+2xy+4y^2)(x+2y)(x^2-2xy+4y^2)$
$(4x^2)^3+(y^2)^3$
$(4x^2+y^2)(16x^4-4x^2y^2+y^4)$
$(27x^3-y^3)(27x^3+y^3)$
$(3x-y)(9x^2+3xy+y^2)(3x+y)(9x^2-3xy+y^2)$
$(9x^2)^3+(y^2)^3$
$(9x^2+y^2)(81x^4-9x^2y^2+y^4)$
$(9x^2)^3+(4y^2)^3$
$(9x^2+4y^2)(81x^4-36x^2y^2+16y^4)$
$(8x^3-125y^3)(8x^3+125y^3)$
$(2x-5y)(4x^2+10xy+25y^2)(2x+5y)(4x^2-10xy+25y^2)$
$[(a+b)-(c-d)][(a+b)+(c-d)]$
$[a+b-c+d][a+b+c-d]$
$[(a+2b)-(3a-4b)][(a+2b)+(3a-4b)]$
$[a+2b-3a+4b][a+2b+3a-4b]$
$[-2a+6b][4a-2b]$
$4[-a+3b][2a-b]$
$[(a+3b)-(2c-d)][(a+3b)+(2c-d)]$
$[a+3b-2c+d][a+3b+2c-d]$
$[(3a+b)-(a-b)][(3a+b)+(a-b)]$
$[2a+2b][4a]$
$2[a+b][4a]$
$8a(a+b)$
$[(a+b)-(c-d)][(a+b)^2+(a+b)(c-d)+(c-d)^2]$
$[a+b-c+d][a^2+2ab+b^2+ac-ad+bc-bd+c^2-2cd+d^2]$
$[(a+3b)+(4a-b)][(a+3b)^2-(a+3b)(4a-b)+(4a-b)^2]$
$[5a+2b][a^2+6ab+9b^2-4a^2+ab-12ab+3b^2+16a^2-8ab+b^2]$
$[5a+2b][13a^2-13ab+13b^2]$
$13[5a+2b][a^2-ab+b^2]$

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