Question

Using suitable
identity find
(7x – 3y)².​

Answer 1

Answer:

${(7x - 3y)}^{2} \\ {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} \\ = {(7x)}^{2} - (2 \times 7x \times 3y) + {(3y)}^{2} \\ = 49 {x}^{2} - 42xy + 9 {y}^{2}$

Answer 2

Answer:

49x^2 - 42xy + 9y^2

Step-by-step explanation:

By using identity 2

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

(7x – 3y)² = (7x)^2 - 2(7x)(3y) + (3y)^2

= 49x^2 - 42xy + 9y^2

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