Question

Using identity solve:
Simplify :3x(12x − 5) − 3 for x = 2

Answer 1

Answer:

=> (3x-2) (2x+3) – (3x+5) (x-1)

Use this identity

( a - b ) ( c + d ) = ac + ad - bc - bd

=> (3x-2) (2x+3) – (3x+5) (x-1)

=> (3x × 2x + 3x × 3 - 2 × 2x - 3 × 2)-( 3x × x - 1 × 3x + 5 × x -5 × 1 )

=>( 6x² + 9x - 4x - 6 ) - ( 3x² - 3x + 5x - 5 )

=> ( 6x² + 5x - 6 ) - ( 3x² + 2x - 5

BY RAEES

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Answer 2

Answer:

$3x(12x - 5) - 3 \: \: \: \: \: \: \: x = 2 \\ = 3 \times 2(12 \times 2 - 5) - 3 \\ = 3 \times 2(24 - 5) - 3 \\ = 3 \times 2 \times 19 - 3 \\ = 6 \times 19 - 3 \\ = 342 - 3 \\ = 339$

This is the answer my friend.

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