Question

решите уравнение (4х-7)²=81

Answer 1

$(4x-7)^2=81 Leftrightarrow left[begin{array}{I} 4x-7=9 \ 4x-7=-9 end{array}} Leftrightarrow left[begin{array}{I} 4x=16 \ 4x=-2 end{array}} Leftrightarrow left[begin{array}{I} x=4 \ x=- dfrac{1}{2} end{array}}$