Răspuns :
a) (x+3)² = x²+6x+9
b) (x-2)² = x²-4x+4
c) (x-1)(x+1) = x²-1
d) (√3+√2)² = √3²+2*√3*√2+√2² = 3+2√6+2 = 5+2√6
Pt. a), b) si d) am aplicat formula (a+b)² = a²+2ab+b².
Pt. c) am aplicat formula (a-b)(a+b) = a²-b².
a) (x+3)² = x²+6x+9
b) (x-2)² = x²-4x+4
c) (x-1)(x+1) = x²-1
d) (√3+√2)² = √3²+2*√3*√2+√2² = 3+2√6+2 = 5+2√6
Pt. a), b) si d) am aplicat formula (a+b)² = a²+2ab+b².
Pt. c) am aplicat formula (a-b)(a+b) = a²-b².