Answer:
a = -2
b = 5
Step-by-step explanation:
We can identify the right side of the equation as completing the square. So, we simply complete the square for x² - 4x + 9 to find our answer,
Step 1: Isolate xs
x² - 4x = -9
Step 2: Complete the square
x² - 4x + 4 = -9 + 4
(x - 2)² = -5
Step 3: Move -5 over
(x - 2)² + 5
And we have our answer!
45 + 32 + 37 = 114
114÷3 = 38
4 total quizzes,
for a 40 average on 4 quizzes she needs 40*4 = 160 total points
for 3 quizzes she has 45 +32 +37 = 114 points
160-114 = 46, she needs at least a 46 on the 4th quiz
Step-by-step explanation:
9.1
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