Question

Упростите выражение.просьба все подробно

Answer 1

1)(4-y)(y+4)+(y+3)²=16-y²+y²+6y+9=6y+25
2)(x-2)(x+4)-(x+1)²=x²+2x-8-x²-2x-1=-9
3)(a-4)²-2a(3a-4)=a²-8a+16-6a²+12a=-5a²+4a+16

Answer 2

$1) (4-y)(y+4)+(y+3)^2=(4-y)(4+y)+y^2+9+6y=\\=16-y^2+y^2+9+6y=16+9+6y=6y+25\\\\2)(a-4)^2-2a(3a-4)=a^2+16-8a-6a^2+8a=16-5a^2\\ \\ 3)(x-2)(x+4)-(x+1)^2= x^{2} +4x-2x-8- x^{2} -1-2x=\\=-8-1=-9$