Question

Com a fórmula resolutiva, resolver a equação 2x2 + 7x + 5=0

Answer 1

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2x²+7x+5=0

a=2
b=7
c=5

Δ=b²-4ac
Δ=7²-4(2)(5)
Δ=49-40
Δ=9

x=(-b±√Δ)/2a

$x= \frac{-7\pm \sqrt{9}}{4}= \frac{-7\pm3}{4} \\ \\ x'= \frac{-7+3}{4} =-\frac{4}{4} =-1\\ \\ x"= \frac{-7-3}{4} =- \frac{10}{4}=- \frac{5}{2}$