Young Salinas
06/26/2024 · Junior High School
Determine os zeros se existir das funções abaixo ,o vértice da parábola faça o esboço do gráfico. A) \( = \) y \( 4 x^{2}+2 x-2 \).
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Para determinar os zeros da função \( y = 4x^{2} + 2x - 2 \), precisamos encontrar os valores de \( x \) para os quais \( y = 0 \).
Para encontrar os zeros, resolvemos a equação \( 4x^{2} + 2x - 2 = 0 \).
Vamos resolver essa equação para encontrar os zeros da função.
Solve the quadratic equation by following steps:
- step0: Solve by factoring:
\(4x^{2}+2x-2=0\)
- step1: Factor the expression:
\(2\left(x+1\right)\left(2x-1\right)=0\)
- step2: Divide the terms:
\(\left(x+1\right)\left(2x-1\right)=0\)
- step3: Separate into possible cases:
\(\begin{align}&2x-1=0\\&x+1=0\end{align}\)
- step4: Solve the equation:
\(\begin{align}&x=\frac{1}{2}\\&x=-1\end{align}\)
- step5: Rewrite:
\(x_{1}=-1,x_{2}=\frac{1}{2}\)
A equação \(4x^{2} + 2x - 2 = 0\) tem dois zeros reais: \(x = -1\) e \(x = \frac{1}{2}\).
Agora, para encontrar o vértice da parábola, podemos usar a fórmula \(x = -\frac{b}{2a}\) para encontrar a coordenada \(x\) do vértice, e substituir esse valor na função para encontrar a coordenada \(y\) do vértice.
Vamos calcular o vértice da parábola.
Calculate the value by following steps:
- step0: Calculate:
\(-\frac{2}{2\times 4}\)
- step1: Calculate:
\(\frac{2}{2\times 4}\)
- step2: Multiply the numbers:
\(\frac{2}{8}\)
- step3: Reduce the fraction:
\(-\frac{1}{4}\)
O vértice da parábola é \( (-0.25, y) \).
Agora, vamos substituir \( x = -0.25 \) na função \( y = 4x^{2} + 2x - 2 \) para encontrar a coordenada \( y \) do vértice.
Calculate the value by following steps:
- step0: Calculate:
\(4\left(-0.25\right)^{2}+2\left(-0.25\right)-2\)
- step1: Convert the expressions:
\(4\left(-\frac{1}{4}\right)^{2}+2\left(-0.25\right)-2\)
- step2: Multiply the terms:
\(\frac{1}{4}+2\left(-0.25\right)-2\)
- step3: Multiply the numbers:
\(\frac{1}{4}-0.5-2\)
- step4: Subtract the numbers:
\(\frac{1}{4}-2.5\)
- step5: Convert the expressions:
\(\frac{1}{4}-\frac{5}{2}\)
- step6: Reduce fractions to a common denominator:
\(\frac{1}{4}-\frac{5\times 2}{2\times 2}\)
- step7: Calculate:
\(\frac{1}{4}-\frac{10}{4}\)
- step8: Transform the expression:
\(\frac{1-10}{4}\)
- step9: Subtract the numbers:
\(\frac{-9}{4}\)
- step10: Calculate:
\(-\frac{9}{4}\)
O vértice da parábola é \( (-0.25, -2.25) \).
Agora, vamos esboçar o gráfico da função \( y = 4x^{2} + 2x - 2 \) com os zeros e o vértice marcados.
Quick Answer
Os zeros da função são \( x = -1 \) e \( x = \frac{1}{2} \). O vértice da parábola é \( (-0.25, -2.25) \).
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