Question

Найдите значения выражение поже ​

Answer 1

$1)(a+4)^{2}-(a-2)(a+2)=a^{2}+8a+16-a^{2}+4=8a+20\\\\a=-0,3 \ \Rightarrow \ 8a+20=8*(-0,3)+20=-2,4+20=\boxed{17,6}\\\\2)(x-4)^{2}-(x-3)(x+3)=x^{2} - 8x + 16-x^{2}+9= 25-8x\\\\x=-4,2 \ \Rightarrow \ 25-8x=25-8*(-4,2)=25+33,6=\boxed{58,6}$

$3)(m+5)^{2}-(m-25)(m+25)=m^{2}+10m+25-m^{2}+625=10m+650\\\\m=-0,7 \ \Rightarrow \ 10m+650=10*(-0,7)+650=-7+650=\boxed{643}\\\\4)(n+8)^{2}-(n-16)(n+16)=n²+16n+64-n^{2}+256=16n+320\\\\n=\frac{1}{4} \ \Rightarrow \ 16n+320=16*\frac{1}{4}+320=4+320=\boxed{324}$