Question

(×+6).(×+6)
(×-7).(×-7)
(y+9).(y-9)
(2×+5).(2×+5)
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Answer 1

Explicação passo-a-passo:

(x+6).(x+6)= x² +6x +6x +36= x² +12x +36

(x-7).(x-7)=x² -7x -7x +49= x² -14x +49

(y+9).(y-9)= y² -9y +9y -81= y² - 81

(2x+5).(2x+5)= 4x² +10x +10x +25= 4x²+20x+25