Question

a^2−8ab+16b^2=81, find a–4b

Answer 1

Answer: 9

Step-by-step explanation:

(a - 4b)^2 = a^2 - 8ab + 16b^2

[Using (a-b)^2 notation]

Now since a^2 - 8ab + 16b^2 = 81

That means (a - 4b)^2 = 81

So a - 4b = √81

= 9

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