A) (2x-7y) (4x+3y) б) (5x-3y) ^2

Question

Алгебра

Гурьян

13 июля, 13:31

A) (2x-7y) (4x+3y) б) (5x-3y) ^2

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Ответы (2)

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Ростиславка · Answer 1

A) (2x-7y) (4x+3y) = 2x * (4x + 3y) - 7y * (4x + 3y) = 8x^2 + 6xy - 28xy - 21y^2 = 8x^2 - 22xy - 21y^2

б) (5x-3y) ^2 = (5x) ^2 - 2*5x*3y + (3y) ^2 = 25x^2 - 30xy + 9y^2

или (5x-3y) ^2 = (5x - 3y) * (5x - 3y) = 5x * (5x - 3y) - 3y * (5x-3y) = 25x^2 - 15xy - 15xy + 9y^2 = 25x^2 - 30xy + 9y^2

Владислава · Answer 2

(2x-7y) (4x+3y) = - 21*y^2-22*x*y+8*x^2

(5x-3y) ^2=9*y^2-30*x*y+25*x^2