1)
x² + 5x = 0
y² - 8 = 0
21x² = 0
2)
x² - 13x + 21 =0
a = 1 b = - 13 c = 21
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Verified answer
1)
x² + 5x = 0
y² - 8 = 0
21x² = 0
2)
x² - 13x + 21 =0
a = 1 b = - 13 c = 21