Question

Помогите все баллы даю

Answer 1

$x=-\dfrac{3}{4}\\\\\\\dfrac{4-7x^2}{2-x}-\dfrac{6x^2}{2-x}=\dfrac{4-7x^2-6x^2}{2-x}=\dfrac{4-13x^2}{2-x}=\dfrac{4-13\cdot \frac{9}{16}}{2+\frac{3}{4}}=\dfrac{-53\cdot 4}{16\cdot 11}=\\\\\\=-\dfrac{53}{44}=-1\dfrac{9}{44}$