Question

*(2a - 5b)² = ?*

1️⃣ 4a² - 10ab + 25
2️⃣ 4a² +10ab + 25
3️⃣ 4a² - 10ab - 25
4️⃣ 4a² + 10ab - 25​

Answer 1

(2a-5b)^2

using identity (a-b)^2 = (a)^2 + (b)^2 - 2ab

so,

(2a)^2 + (5b)^2 - 2 (2a) (5b)

4a^2 + 25b^2 - 20ab.

Answer 2

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