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b)(2x+4)² = 4x²+16x+16
c)(3+2x)² = 9+12x+4x²
d)(x²+1)² = x⁴ +2x²+1
e)(2a+5b)² = 4a²+20ab+25b²
f)(3xy+1)² = 9x²y²+6xy+1
g)(√3+1)² = 3+2√3+1 = 4+2√3
h)(1+√2)² = 1+2+2√2 = 3+2√2
i)(√3+√12)² = 3+12+12 = 27