Question

упростите выражения:
(a-4)(a+3)-(a-5)^2

(3x-y)^2+12xy

y3+(4-y)(16+4y+y^2)

Answer 1

$1.$$a^2-a-12+(-a^2+2ab-b^2)$
$2ab-b^2-a-12$
$2.$$9x^2-6xy+y^2+12xy$
$9x^2+6xy+y^2$
$3.$$3y+(64-y^3)$
$-y^3+3y+64$