Объяснение:
x2 + 28x + 75 = 0
(25 + x)(3 + x) = 0
1)25 + x = 0
25 + -25 + x = 0 + -25
25 + -25 = 0
0 + x = 0 + -25
x = 0 + -25
0 + -25 = -25
x = -25
2)3 + x = 0
3 + -3 + x = 0 + -3
3 + -3 = 0
0 + x = 0 + -3
x = 0 + -3
0 + -3 = -3
x = -3
ответ: x = {-25, -3}
Объяснение:
x2 + 28x + 75 = 0
(25 + x)(3 + x) = 0
1)25 + x = 0
25 + -25 + x = 0 + -25
25 + -25 = 0
0 + x = 0 + -25
x = 0 + -25
0 + -25 = -25
x = -25
2)3 + x = 0
3 + -3 + x = 0 + -3
3 + -3 = 0
0 + x = 0 + -3
x = 0 + -3
0 + -3 = -3
x = -3
ответ: x = {-25, -3}