Question

5. Решите уравнения:
а) х2 – (х – 4)(х + 4) = 8х.

Answer 1

$x ^ { 2 } -(x-4)(x+4)=8x \\ x^{2}-\left(x^{2}-16\right)=8x \\ x^{2}-x^{2}+16=8x \\ 16=8x \\ 8x=16 \\ x=\frac{16}{8} \\ x = 2$