X^4-14x^2+49 which pattern can we use to factor the expression. U and V are either
constant integers or single variables expressions

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the cost of the pair of pants is $31.95

1. a^4+8a^3+24a^2+32a+16

2.y^8+8y^7+28y^6+56y^5+70y^4+56y^3+28y^2+8y+1

3.x^6-3x^4y^2+3x^2y^4-y^6