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= x(x + 3) + 3(x + 3)
= (x + 3)(x + 3)
b.) 4x² - 4x + 1 = 4x.x - 2x - 2x - 2x + 1.1
= 2x(2x - 1) - 1(2x - 1)
= (2x - 1)(2x - 1)
c.) x² + 2x + 1 = x.x + x + x + 1.1
= x(x + 1) + 1(x + 1)
= (x + 1)(x + 1)
4.a.)