Question

X(X+11)+2(X+21=0
(Estou colocando essas palavras porque são no mínimo 20 caracters)

Answer 1

X(X+11)+2(X+21)=0
x²+11x+2x+42=0
x² + 13x + 42 = 0

Bhaskara
b² - 4ac
13² - 4.1.42
169 - 168
1 = delta

-b +/- √Δ/2a
-(13) +/- √1/2.1
-13 +/- 1/2

x1 = -13+1/2 = -12/2 = -6
x2 = -13-1/2 = -14/2 = -7

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