Question

( 10 - y ) ( 10 + y ) = ? Pa answer po please

Answer 1

Let's factorise it :

$\: {\qquad \dashrightarrow \sf ( 10 - y ) ( 10 + y) }$

$\: {\qquad \dashrightarrow \sf 10(10 + y) + [ - y(10 + y)] }$

Using distributive property we get :

$\: {\qquad \dashrightarrow \sf {10}^{2} + 10y+ (- 10y - {y}^{2} ) }$

$\: {\qquad \dashrightarrow \sf {10}^{2} \: \cancel { + 10y }\: \: \cancel{ - 10y } - {y}^{2} }$

$\: {\qquad \dashrightarrow \sf 100 - {y}^{2} }$

Therefore,

${{{\qquad \dashrightarrow \sf ( 10 - y ) ( 10 + y) = 100 - {y}^{2}}}}$