Question

Ayúdeme porfissss
Les doy 15 estrellas y la coronita.

Answer 1

Respuesta:

$1)~~24x^3-10x^2-7x$

$2)~~-7a^2+2ab-26b^2$

$3)~~5x+4y-9z$

Explicación paso a paso:

1)  

     $(8x^3+6x^2-10x)+(-2x+7x^3-4x^2)+(9x^3+5x-12x^2)\\\\8x^3+6x^2-10x-2x+7x^3-4x^2+9x^3+5x-12x^2\\\\(8x^3+7x^3+9x^3)+(6x^2-4x^2-12x^2)+(-10x-2x+5x)\\\\24x^3+(-10x^2)+(-7x)\\\\24x^3-10x^2-7x$

2)

     $(2a^2+3ab-9b^2)+(5ab-12a^2-15b^2)+(-2b^2-6ab+3a^2)\\\\2a^2+3ab-9b^2+5ab-12a^2-15b^2-2b^2-6ab+3a^2\\\\(2a^2-12a^2+3a^2)+(3ab+5ab-6ab)+(-9b^2-15b^2-2b^2)\\\\(-7a^2)+2ab+(-26b^2)\\\\-7a^2+2ab-26b^2$

3)

    $(6x+9y-14z)+(15y+16z-9x)+(-20y+8x-11z)\\\\6x+9y-14z+15y+16z-9x-20y+8x-11z\\\\(6x-9x+8x)+(9y+15y-20y)+(-14z+16z-11z)\\\\5x+4y+(-9z)\\\\5x+4y-9z$