Question

(12x + 7)(3x − 5) − (6x + 11)(6x − 11) = 122 − 43x

Answer 1

Respuesta:

$x=9$

Explicación paso a paso:

$\left(12x+7\right)\left(3x-5\right)-\left(6x+11\right)\left(6x-11\right)=122-43x\\\\\left(12x+7\right)\left(3x-5\right)-\left(6x+11\right)\left(6x-11\right)\\\\\left(12x+7\right)\left(3x-5\right)\\\\=12x\cdot \:3x+12x\left(-5\right)+7\cdot \:3x+7\left(-5\right)\\\\=12\cdot \:3xx-12\cdot \:5x+7\cdot \:3x-7\cdot \:5\\\\=36x^2-39x-35\\\\=36x^2-39x-35-\left(6x+11\right)\left(6x-11\right)\\\\=36x^2-39x-35-36x^2+121\\\\=-39x+86\\\\-39x+86=122-43x\\\\-39x+86-86=122-43x-86\\\\-39x=-43x+36$

$-39x=-43x+36\\\\-39x+43x=-43x+36+43x\\\\4x=36\\\\\frac{4x}{4}=\frac{36}{4}\\\\x=9$

Answer 2

La respuesta es 9

Explicación paso a paso:

Espero te sirva