Question

1) factorise x2-16. Please tell​

Answer 1

Answer:

( x + 4 ) ( x - 4 )

Step-by-step explanation:

x^2 - 16

= x^2 - 4^2

a^2 - b^2 = ( a + b ) ( a - b )      { Identity / formula }

Here,

a = x

b = 4

x^2 - 4^2 = ( x + 4 ) ( x - 4 )

Answer 2

$\Huge\mathfrak\purple{answer:}$

$\sf{ }$

$\large\bf{{\underline{To~factorise}}:}$

$\tt{~~~~~~x^{2}-16}$

$\bf{Identity~to~be~used:}$

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

$\tt{:→ x^{2}-16}$

$\tt{:→ (x)^{2}-(4)^{2}}$

$\tt{:→ {\purple{\underline{\boxed{\bf (x+4)(x-4)}}}}}$

$\bf\therefore{Factors~are:}$

${ \bf \purple {x + 4}} \: \: \: \: \sf and \: \: \: \: \: { \bf \purple{x - 4}}$