Question

( 6x - 7 ) ( 6x +7). ​

Answer 1

(a+b)(a-b)=a²-b²

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

$6 {x}^{2} + 2 \times 6x \times 7 - 7x {}^{2} \\ 6 x {}^{2} + 6x \times 14 - 7x {}^{2} \\ 36x + 34x - 49x \\ 70x - 49x \\ 21x$