November 2018 1 16 Report
Pogrupuj składniki i zapisz wyrażenie w postaci różnicy kwadratów wyrażeń.

a) 4 a^{2} -12a+9-9 x^{2}
b) 49 y^{2} - 1+6a-9 a^{2}
c) 16 x^{2} -4-12y-9 y^{2}
d)9 x^{2} +6x+1-49 a^{2} +28ab-4 b^{2}

Z góry dzięki :)
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