Question

(x-4)(x+4)-3x=(x-2)la a doua

Answer 1

$(x-4)(x+4)-3x=(x-2)^2 \\ x^2-16-3x=x^2-2 \cdot x \cdot 2+2^2 \\ x^2-16-3x=x^2-4x+4 \\ x^2-3x-x^2+4x=4+16 \\ x=20$