Question

if a+b=9 ; a-b=5. find a2-b2?​

Answer 1

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

$( {a}^{2} - {b}^{2} ) = 9 \times 5 \\ ( {a}^{2} - {b}^{2} )= 45$

Answer 2

$a + b = 9 \: \: and \: \: a - b = 5$

Since,

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

So,

${a}^{2} - {b}^{2} = 9 \times 5 = 45$

hope it will help u ✨☺️