Question

Найти корень уравнения: х^2- (х+3)^2=0
1) – 2
2) 0
3) 1, 5

Answer 1

${x}^{2} - (x + 3) {}^{2} = 0 \\ (x + x + 3)(x - x - 3) = 0 \\ - 3 (2x + 3) = 0 \\ 2x + 3 = 0 \\ 2x = - 3 \\ x = - 3 \div 2 \\ x = - 1.5$