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3 years ago

Use a special-product rule to factor the perfect-square trinomial. 81y^2+ 126y + 49

Mathematics

1 answer:

Ivahew [28]3 years ago

7 0

Answer:

The perfect -square trinomial

(9y+7)²

Step-by-step explanation:

<u><em>Explanation:-</em></u>

Given polynomial equation

81 y² + 126 y +49

⇒ 9² y² + 2(9)(7)y + 7²

⇒ (9y)² + 2(9)(7)y +7²

we will use formula

(a+b)² = a² + 2ab +b²

⇒ (9y+7)²

<u><em>Final answer:-</em></u>

The perfect -square trinomial

(9y+7)²

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Step-by-step explanation:

Step 1

Null hypothesis: The average damaging temperature of nine iPods is 5°F

Alternate hypothesis: The average damaging temperature of nine iPods differs from 5°F

Step 2

Mean=5°F, Sd=3, df=n-1=9-1=8

The t-value corresponding to 8 degrees of freedom and 95% confidence level (5% significance level) is 2.306

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