Josephine solved a quadratic equation. Her work is shown below.
In which step did Josephine make an error?
5(x + 7)2 = 245
(x + 7) = 49
Step 1
*+7=7
Step 2
x = 0
Step 3
Choose1 answer.

Step 2

General Formulas and Concepts:

Pre-Algebra

Algebra I

Step-by-step explanation:

Step 1: Define

Identify

5(x + 7)² = 245

Step 2: Solve for x

Here, we can see that Josephine made an error at step 2, when she square rooted both sides. Remember when you square root both sides of a quadratic, you will have a ± sign and have multiple roots/solutions.

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

126.66 m²

step-by-step explanation:

the pertinent area formula is a = πr², where r is the radius.

here, a = π(6.35 m)² = 40.32π, or approximately 126.66 m²