Question

Find the value of the following by using the suitable identities. a) (2x-3) ²
b) (3y+7) (3y-7)​

Answer 1

$\huge\underline{\red{Answer}}$

a) (2x - 3)²

= (2x)² - 2 × 2x × 3 + 3²

= 4x² - 12x + 9

b) (3y + 7) (3y - 7)

= (3y)² - 7²

= 9y² - 49

Answer 2

Answer:

Solution:

a)(2x-3)^2

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

Step-by-step explanation:

(2x)^2-2(2x)(3)+(3)^2

4x^2-12x+9

b)(3y)^2-(7)^2

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

9y^2-49

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