Question

решите уравнение
(X²-16) + (X²+X-12) = 0

Answer 1

(x-4)(x+4)+3x(x-4)=0
x^2+4x-4x-16+3x^2-12x
4x^2-12x-16=0. /4
x^2-3x-4=0
D= 9+16=25=5
x1=9+5÷2=7
x2=9-5÷2=2