Help me ASAP for brainliest:
Cedric completed the square for the quadratic expression 5x...
Mathematics, 17.04.2020 18:59, mckinley2006
Help me ASAP for brainliest:
Cedric completed the square for the quadratic expression 5x2β40x+15 in order to determine the minimum value of the expression, as shown.
Step 1: 5(x2β8x+3)
Step 2: 5(x2β8x+16β16+3)
Step 3: 5((x+4)2β16+3)
Step 4: 5((x+4)2β13)
Step 5: 5(x+4)2β65
What mistake, if any, did Cedric make?
A. In Step 3, he incorrectly wrote the square as (x+4)2. He should have written xβ42.
B. In Step 1, he incorrectly factored out 5. He should have written 5(x2β8xβ3).
C. In Step 5, he incorrectly distributed 5 from the parentheses. He should have written 5(x+4)2β13.
D. He did not make a mistake.
E. In Step 2, he incorrectly added 16 and β16. He should have written 5(x2β8x+64β64+3).
Answers: 3
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