23a²-[7a-{11a²-9a-(23-15a-17a²)}]
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Answer:
51a²-a-23
Step-by-step explanation:
23a²-[7a-{11a²-9a-(23-15a-17a²)}]
= 23a²-[7a-{11a²-9a-23+15a+17a²}
= 23a²-[7a-{28a²+6a-23}
= 23a²-[7a-28a²-6a+23]
=23a²-[ -28a²+a+23]
= 23a² +28a²-a-23
= 51a²-a-23
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