Question

Find : (4m – 5n)²

a.4m²– 20mn + 5n²

b.16m² - 40mn + 25n²

c.16m² + 25n²

d.16m² - 25n²

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Answer 1

Answer:

(4m-5n)^2

=16m^2+25n^2-40mn

Answer 2

Answer:

(b) 16m² - 40mn + 25n²

Step-by-step explanation:

We can use the ( a - b )² identity to find the answer.