Question

Упростите выражения
(b-4)2=
y2-36=
(y+4)2-5y(y-6)=
81y2-100=
(9c2+d2)(3c-d)(3c+d)=

Answer 1

$1)(b-4)^2=b^2-2b*3+4^2=b^2-8b+16 \ \ 2)y^2-36=(y-6)(y+6) \ \ 3)(y+4)^2-5y(y-6)=y^2+8y+16-5y^2+30y=-4y^2+38y+16 \ \ 4)81y^2-100=(9y-10)(9y+10) \ \ 5)(9c^2+d^2)(3c-d)(3c+d)=(9c^2+d^2)(9c^2-d^2)=81c^4-d^4$