Question

Tìm x, biết

d) (x -6)(x-6) -x(x-4)=4

Answer 1

\(\left(x-6\right)\left(x-6\right)-x\left(x-4\right)=4\)

\(\Leftrightarrow x^2-12x+36-x^2+4x=4\)

\(\Leftrightarrow36-8x=4\)

\(\Leftrightarrow8x=36-4\)

\(\Leftrightarrow8x=32\)

\(\Leftrightarrow x=32:8\)

\(\Leftrightarrow x=4\)

Answer 2

\(\left(x-6\right)\left(x-6\right)-x\left(x-4\right)=4\)

\(x^2-6^2-x^2-4x=4\)

\(6^2-4x=4\)

\(4x=36+4\)

\(4x=40\)

\(x=10\)