A. X? – 25 = 0b. X?+ 10x + 21 = 0​

Jawaban:

a. x = 25

b. x = {-3,-7}

Penjelasan:

a. x – 25 = 0

x = 25

b. x + 10x + 21 = 0

… × … = 21

… + … = 10

3 × 7 = 21

3 + 7 = 10

(x+3) (x+7)

x + 3=0 atau x + 7 = 0

x = -3 x = -7

#semogamembantu