Question

Using properies of squares and square roots find {(19^2) - (18^2)}

Answer 1

${19 }^{2} - {18}^{2}$
a2-b2=(a+b)(a-b)
${19}^{2} - {18 }^{2} = (19 + 18)(19 - 1)$
$= (37)(1)$
=37