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3 years ago

11

you talk on the phone y minutes on a day x of every month according to the equation y=2x+1. The cellphone company claims you tal

ked 12 minutes on the phone on the fourth day of the month. Are they right?

1 answer:

Mademuasel [1]3 years ago

4 0

No they are not , y= 2(4)+1 is 9 not 12

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scoundrel [369]

Answer:

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Step 3

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$2 {p}^{2} - 3p - 7 - (3 {p}^{2} + p - 5)$

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What are the solutions of x2 + 10x + 16 = 0?

Ivahew [28]

x

=

−

8

,

−

2

Explanation:

Given:

x

2

+

10

x

+

16

=

0

To complete the square put the two

x

terms on the left and the constant on the right of the equation:

x

2

+

10

x

=

−

16

Complete the square by multiplying the

x

-term by

1

2

:

1

2

⋅

10

=

5

and adding the square of this number to the right side of the equation:

5

2

=

25

(

x

+

5

)

2

=

−

16

+

25

UNDERSTANDING CHECK:

(

x

+

5

)

2

=

x

2

+

10

x

+

25

.

The

+

25

was not in the original equation. If we add

+

25

to one side of the equation, we must add the same amount to the other side of the equation to keep it balanced.

(

x

+

5

)

2

=

9

To solve, square root both sides of the equation:

√

(

x

+

5

)

2

=

±

√

9

x

+

5

=

±

3

x

=

−

5

±

3

x

=

−

5

+

3

=

−

2

,

x

=

−

5

−

3

=

−

8

x

=

−

8

,

−

2

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