Question

square of
$5 - \sqrt{ { {y}^{2} - 25} }$
​

Answer 1

${\blue{\bf{Hola!!!}}}$

${(5-{\sqrt{{y^2}-25}}})^2$

$(5-y-5)^2$

Using the identity:-

(a+b+c)²=a²+b²+c²+2ab+2bc+2ca

a=5
b=-y
c=-5

=5²+(-y)²+(-5)²+2(5×(-y))+2(-y×(-5))+2(-5×5)

=25+y²+25-10y+10y-50
=25+25-50-10y+10y+y²
=50-50+y²
=0+y²

${\bf{\pink{Answer:-y^2}}}$