Question

encontre as raizes das equacoes
a) X²-10x+21=0.
b) X²-3x-10=0
c) x²+7x+6=0
d) X²+2x-15=0

Answer 1

Oi Karol

a) x² - 10x + 21 =0 ⇒ (x - 3)*(x - 7) = 0 ⇒ x1 = 3, x2 = 7
b) x² - 3x - 10 = 0   ⇒ (x - 5)*(x + 2) = 0 ⇒ x1 = 5, x2 = -2
c) x² + 7x + 6 = 0    ⇒ (x + 1)*(x + 6) = 0 ⇒ x1 = -1, x2 = -6
d) x² + 2x - 15 = 0   ⇒ (x + 5)*(x - 3) = 0 ⇒ x1 = -5 , x2 = 3

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