Question

$(x + 20)(x - 10) = 52x + 5$
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Answer 1

Resposta:

Explicação:

(x + 20)(x - 10) = 52x + 5

x²-10x+20x-200 = 52x + 5

x²-10x+20x-52x -200-5 = 0

x² - 42x - 205 = 0

Δ = b²-4.a.c

Δ = (-42)² - 4.1.(-205)

Δ = 1764 + 820

Δ = 944

x' = -b+√Δ/2.a

x' = - (-42)² + √944/2.1

x' = 1764 + 30,72/2

x' =  1794.72/2

x' = 897,36

x" = -b+√Δ/2.a

x' = - (-42)² - √944/2.1

x' = 1764 - 30,72/2

x' =  1733.28/2

x' = 866,64