Some help me before my math grade drops lower than my self-esteem. Cedric completed the square for the quadratic expression 5x^2−40x+15 in order to determine the minimum value of the expression, as shown.
Step 1: 5(x^2−8x+3)
Step 2: 5(x^2−8x+16−16+3)
Step 3: 5((x+4)^2−16+3)
Step 4: 5((x+4)^2−13)
Step 5: 5(x+4)^2−65
What mistake, if any, did Cedric make?
(Primavera needs to get canceled)

step 1  5(x^2−8x+3) = 5

x

2

+

8

x+

3

For a polynomial of the form  

a

x

2

+

b

x

+

c

, rewrite the middle term as a sum of two terms whose product is  

a

⋅

c

=

5

⋅

3

=

15

and whose sum is  b

=

8

.

5

x

2

+

3

x

+

5

x

+

3

Factor out the greatest common factor from each great

x

(

5

x

+

3

)

+

1

(

5

x

+

3

)

Factor the polynomial by factoring out the greatest common factor,  5

x

+

3

.

(

5

x

+

3

)

(

x

+

1

)

-3    +    -1    =    -4  

     -1    +    -3    =    -4  

     1    +    3    =    4  

     3    +    1    =    4  

5 • (x2 - 8x + 3)

x=13

x=−5

~Hope For The Dinos

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.