Explicație pas cu pas:
a)
[tex](7 - 3) { }^{2} = 4 {}^{2} = 16[/tex]
[tex]7 {}^{2} + 2 \times 7 \times ( - 3) + ( - 3) {}^{2} = 49 + 14 \times ( - 3) + 9 = 49 + ( - 42) + 9 = 49 - 42 + 9 = 7 + 9 = 16[/tex]
[tex]16 = 16[/tex]
b)
[tex]( - 3 + 5) { }^{2} = 2 {}^{2} = 4[/tex]
[tex]( - 3) {}^{2} + \times ( - 3) \times 5 + 5 {}^{2} = 9 + ( - 6) \times 5 + 25 = 9 - 30 + 25 = 4[/tex]
[tex]4 = 4[/tex]
c)
[tex]( - 6) {}^{2} - ( - 3) {}^{2} = 36 - 9 = 27[/tex]
[tex](( - 6) - ( - 3)) \times (( - 6) + ( - 3)) = ( - 6 + 3) \times ( - 6 - 3) = - 3 \times ( - 9) = 27[/tex]
[tex]27 = 27[/tex]
