Question

7(a-3b)(a+3b). please solve any one​

Answer 1

HIII.......{∆}

THERE IS YOUR ANSWER....{¶}

$as \: we \: know \: \\ \\ {x}^{2} - {y}^{2} =( x + y)(x - y) \\ \\ so \: similarly \: \\ \\ (a - 3b)(a + 3b) = {a}^{2} - 9 {b}^{2} \\ \\ multiply \: by \: 7 \: on \: both \: sides \\ \\ 7(a - 3b)(a + 3b) = 7( {a}^{2} - 9 {b}^{2} ) \\ \\ 7 {a}^{2} - 63 {b}^{2}$

HOPE YOU LIKE IT....{¶}

^_^

Answer 2

Answer:

$7 {a}^{2} - 63 {b}^{2}$

Step-by-step explanation:

$7( {a}^{2} - {(3b)}^{2} ) \\ 7( {a}^{2} - 9 {b}^{2} ) \\ 7 {a}^{2} - 63 {b}^{2}$