Question

помогите пожалуйста...

Answer 1

Ответ:

1.

$1) (x+5)^{2} = x^{2} +5^{2} =x^{2} +25\\2) (a-2)^{2}=a^{2}-2^{2}=a^{2} -4 \\3) (5a-2)^{2} =5^{2}a^{2} -2^{2}=25 a^{2} -2\\4) (4x+y)^{2} =4^{2} x^{2}+y^{2} =16x^{2} +y^{2} \\5) (a^{2} -1)^{2} =a^{4} -1$

2.

$1) x^{2} +(5x-3)^{2}=x^{2} +5x^{2} -3^{2}=6x^{2} -9\\2) (p-2c)^{2}+3p^{2} =p^{2} -4c^{2} +3p^{2} =4p^{2}-4c^{2}\\3) (a-4)^{2}+a(a+8) = a^{2}-16+a^{2}+8a =-16+8a\\4) x(x-7)+(x+3)^{2} = x^{2}-7x+x^{2}+9 = 2x^{2}-7x+9$