Question

Multiply the following using appropriate identities.

( 3x + 1 ) ( 3x – 8 )​

Answer 1

Answer:

(x + a)(x - b) = x² + (a - b)x -ab

Similarly,

(3x+1)(3x-8)

= (3x)² + (1 - 8)3x - 8

= 9x² - 21x - 8

Answer 2

Answer:

Here's your answer

3x+1/3x=8

Cubing both sides

(3x+1/3x)^3=(8)^3

27×3+1/27×3+3(3x)(1/3x)

(3x+1/3x)=512 (using the identity:(a+b)^3)

27×3+1/27×3+(8)=512

(3x*1/3x=1, 3x+1/3x=8)

27×3+1/27×3+24=512

27×3+1/27×3=512-24

27×3+1/27×3=488

Step-by-step explanation:

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