Plz help me plz............
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put the value of x=1,y=-1
=1/7(9×1+12×1)(9×1-12)
=1/7(9+12)(9-12)
=1/7(21)(-3)
=3×(-3)
=-9
Answered by
1
Step-by-step explanation:
please refer the above attachment..........
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