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nirvana33 [79]
3 years ago
8

Find and explain wallys mistake!!

Mathematics
1 answer:
Marysya12 [62]3 years ago
5 0

Answer:

What Wally did wrong is that it is supposed to be (4a-5)(a-4)

In order to get -21 a. He was supposed to use negative 5 and 4 to get to negative 21

If he used (4a+5)(a+5)

The answer will be positive 21 and that's not what the problem is asking

Step-by-step explanation:

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