4.Factorize (a^2) + 6a + 9
a.(a + 4)^2
b.(a + 3)^2
c.(a + 2)^2
d.(2a + 1)^2
5.Factorize (p^4) + (p^2) + 1
a.(p^2 + 1)^2 - (p^2)
b.(p^2 + 1)^2 + (p^2)
c.(p^2 - 1)^2 + (p^2)
d.(p^2 - 1)^2 - (p^2)
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4.
a²+6a+9
= a²+3a+3a+9
= a(a+3)+3(a+3)
=(a+3)(a+3)
=(a+3)²
5.
p⁴+p²+1
= (p²)²+2.p².1+1-p²
= (p²+1)²-p²
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