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Vilket parentesuttryck ska kvadreras för att få uttrycket \( 16 x^{2}-24 x+9 \) ? \( (4 x+3) \) \( (3-4 x) \) \( (8 x+3) \) \( (8 x-3) \)

Ask by Hilton Weaver. in Sweden
Jan 23,2025

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Answer

\( (3 - 4x) \) ska kvadreras för att få uttrycket \( 16x^{2} -24x +9 \).

Solution

För att få uttrycket \(16x^{2} -24x +9\) genom att kvadrera ett parentesuttryck kan vi testa de givna alternativen: 1. \((4x + 3)^2 = 16x^{2} + 24x + 9\) Detta ger ett plusvärde för \(24x\), vilket inte stämmer överens med det givna uttrycket. 2. \((3 - 4x)^2 = 9 - 24x + 16x^{2}\) Detta resulterar i \(16x^{2} -24x +9\), vilket exakt matchar det önskade uttrycket. 3. \((8x + 3)^2 = 64x^{2} + 48x + 9\) Detta ger fel koefficienter för både \(x^2\) och \(x\). 4. \((8x - 3)^2 = 64x^{2} - 48x + 9\) Detta ger också fel koefficienter för både \(x^2\) och \(x\). Därför är rätt svar: **\( (3 - 4x) \)**

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The Deep Dive

För att kvadrera ett parentesuttryck och få uttrycket \( 16 x^{2}-24 x+9 \) kan vi jämföra det med formen av en kvadrat: \( (a-b)^2 = a^2 - 2ab + b^2 \). Om vi examinerar valet \( (4x - 3) \), får vi \( (4x - 3)^2 = 16x^2 - 24x + 9 \) efter att ha expanderat det, vilket stämmer med det ursprungliga uttrycket. Det är alltid viktigt att kontrollera varje alternativ genom att kvadrera dem. Med andra ord, om du får mindre tid än du behöver, kolla noga varje steg i processen! Det kan vara enkelt att bli bländad av siffrorna, men att vara grundlig sparar dig tid i det långa loppet.

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Point-Slope Form For each row, you and your partner will answer the question shown. Begin by reading each scenario. Using point-slope form, write the equation of the line that describes this scenario. Then, rewrite the equation in slope-intercept form. You and your partner should get the same answer for slope-intercept form. If you disagree, work together to reach an agreement. Partner A 1. In order to enter the state fair, there is an admission cost. Each game is \( \$ 3 \). Steven went to the state fair, played 4 games and spent a total of \( \$ 20 \) on admission and games. 2. At a chili cook off, people pay \( \$ 0.50 \) for each sample bowl of chili. The total cost was \( \$ 4.50 \) for 3 bowls of chili. 3. CJ loves Girl Scout cookies. He eats 3 cookies per hour. After 5 hours, there are 24 cookies left in the box. 4. An oil tank is being filled at a constant rate of 0.2 gallons per minute. After 10 minutes, there are 5 gallons of oil in the tank. 5. The total cost of renting a vacation home includes a deposit and a daily rental fee of \( \$ 125 \). A family rents a vacation home for 5 days and pays \( \$ 700 \). Partner B 1. In order to enter the state fair, there is an admission cost. Each game is \( \$ 3 \). Steven went to the state fair, played 10 games and spent a total of \( \$ 38 \) on admission and games. 2. At a chili cook off, people pay \( \$ 0.50 \) for each sample bowl of chili. The total cost was \( \$ 6.50 \) for 7 bowls of chili. 3. CJ loves Girl Scout cookies. He eats 3 cookies per hour. After 3 hours, there are 30 cookies left in the box. 4. An oil tank is being filled at a constant rate of 0.2 gallons per minute. After 5 minutes, there are 4 gallons of oil in the tank. 5. The total cost of renting a vacation home includes a deposit and a daily rental fee of \( \$ 125 \). A family rents a vacation home for 3 days and pays \( \$ 450 \). Talk About it! Return to Examples 1-5. Identify the \( y \)-intercept in each scenario. Explain the meaning of the \( y \)-intercept in terms of the context.
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