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17.12.2020 • 

Mathematics

Select the correct answer. Sean and Colleen are raking leaves in thelr yard. Working together, they can clear the yard of leaves In 24 minutes. Working alone, It would take
Sean 20 minutes longer to clear the yard than it would take Colleen working alone.
When cis the number of minutes It would take Ccolleen to finish the job when working alone, the situation Is modeled by this rational equation:
How long would It take Colleen alone to clear the yard of leaves?

Ответ:

itzzzabbi

13.03.2022

Mathematics

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1

Step-by-step explanation:

Given a quadratic equation in standard form : ax² + bx + c = 0 (a ≠ 0)

Then the discriminant is calculated as

Δ = b² - 4ac

Given

4x² + 7x + 1 = - 2 ( add 2 to both sides )

4x² + 7x + 3 = 0 ← in standard form

with a = 4, b = 7 and c = 3, thus

b² - 4ac

= 7² - (4 × 4 × 3) = 49 - 48 = 1

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