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Mathematics, 29.05.2021 01:20 maddie6610

Solve using the quadratic formula. Approximate answers to the nearest tenth.

Solve using the quadratic formula. Approximate answers to the nearest tenth.

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Answers: 2

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Answer from: Paris4life

$\displaystyle x=-1, \ 8$

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Algebra I

Standard Form: ax² + bx + c = 0Quadratic Formula: $\displaystyle x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}$

Step-by-step explanation:

Step 1: Define

Identify variables

x² - 7x - 8

↓

a = 1, b = -7, c = -8

Step 2: Solve for x

Substitute in variables [Quadratic Formula]: $\displaystyle x=\frac{7 \pm \sqrt{(-7)^2-4(1)(-8)}}{2(1)}$ [√Radical] Evaluate exponents: $\displaystyle x=\frac{7 \pm \sqrt{49-4(1)(-8)}}{2(1)}$ [√Radical] Multiply: $\displaystyle x=\frac{7 \pm \sqrt{49 + 32}}{2(1)}$ [√Radical] Add: $\displaystyle x=\frac{7 \pm \sqrt{81}}{2(1)}$ [√Radical] Evaluate: $\displaystyle x=\frac{7 \pm 9}{2(1)}$ Multiply: $\displaystyle x=\frac{7 \pm 9}{2}$ Add/Subtract: $\displaystyle x=\frac{-2}{2}, \ \frac{16}{2}$ Divide: $\displaystyle x=-1, \ 8$

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Answer from: Quest

umumumumum

im not sure

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Answer from: Quest

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m 60 second 60 minutes

* * = 54000 meters/ hour

second 1 minute 1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m 1 km

* = 54 km / hours

hour 1000m

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