Answer Key 7.5

$(r-4)(r+4)$
$(x-3)(x+3)$
$(v-5)(v+5)$
$(x-1)(x+1)$
$(p-2)(p+2)$
$(2v-1)(2v+1)$
$3(x^2-9)$
$3(x-3)(x+3)$
$5(n^2-4)$
$5(n-2)(n+2)$
$4(4x^2-9)$
$4(2x-3)(2x+3)$
$5(25x^2+9y^2)$
$(a-1)^2$
$(k+2)^2$
$(x+3)^2$
$(n-4)^2$
$(5p-1)^2$
$(x+1)^2$
$(5a+3b)^2$
$(x+4y)^2$
$2(4x^2-12xy+9y^2)$
$2(2x-3y)^2$
$5(4x^2+4xy+y^2)$
$5(2x+y)^2$
$(2-m)(4+2m+m^2)$
$(x+4)(x^2-4x+16)$
$(x-4)(x^2+4x+16)$
$(x+2)(x^2-2x+4)$
$(6-u)(36+6u+u^2)$
$(5x-6)(25x^2+30x+36)$
$(5a-4)(25a^2+20a+16)$
$(4x-3)(16x^2+12x+9)$
$(4x+3y)(16x^2-12xy+9y^2)$
$4(8m^3-27n^3)$
$4(2m-3n)(4m^2+6mn+9n^2)$

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