Question

multiply the following using appropriate identities
1. (3x+1) (3x-8)​

Answer 1

Answer:

13x2

Step-by-step explanation:

=3x+1+3x-8

=3x+3x+1-8

=6x2+7

=13x2

2 is square.

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Answer 2

✩Given :

• (3x+1) (3x-8)

✩Solution :

⇢3x(3x - 8) + 1(3x - 8)

⇢9x² - 24x + 3x - 8

⇢9x² - 21x - 8

⛤ Explanation ⛤

The above part is multiplied by applying the identity:

(a+b) (a-b) = a² - b²

(a+b) (a-b) = a(a - b) + b(a - b)

⠀⠀⠀⠀⠀⠀ = a² - ab + ba - b²

⠀⠀⠀⠀⠀⠀ = a² - b²

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