1401Tamara

Verified answer

(2х-3)² = 4x^2 - 12x + 9
(0,2с²-0,6)² = 0,04c^4 - 0,24c^2 + 0,36
(4х-у)²-(х+3у)² = 16x^2 - 8xy + y^2 - x^2 - 6xy - 9 y^2 = 15x^2 -14xy-8y^2
(3х+5)² = 9x^2 + 30x + 25
(0,3а²+0,7)²(х+4у)²-(3х-у)²= (0,09a^4 + 0,42a^2 + 0,49)(x^2+8xy+16y^2) - -(9x^2-6xy+y^2) = 0,09a^4x^2 + 0,42a^2x^2 + 0,49x^2 + 0,72a^4xy + 3,36a^2xy + 3,92xy + 1,44a^4y^2 + 6,72a^2y^2 +7,84y^2-9x^2+6xy-y^2 = 0.09a^4x^2 + +0,42a^2x^2 - 8,51x^2+ 0,72a^4xy + 3,36a^2xy + 9,92xy + 1,44a^4y^2 + +6,72a^2y^2 + 6,84y^2