Question

please help me i will mark u brainlist​

Answer 1

For question no. 1, 2 and 3

${a}^{2} - {b}^{2} = (a + b)(a - b)$

for hint:

${3}^{2} = 9 \\ {12}^{2} = 144 \\ {4}^{2} = 16$

and you can write

$( \sqrt{12} )^{2} = 12$

for question 4 and 5

use

$(a + b)^{2} = {a}^{2} + {b}^{2} + 2ab$

$(a - b)^{2} = {a}^{2} + {b}^{2} - 2ab$

Answer 2

HOPE IT'S HELPS YOU........