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Vladimir79 [104]
3 years ago
9

X2 - 4x + 4 = 20 please helpppppppp

Mathematics
2 answers:
Sever21 [200]3 years ago
8 0

Answer:

x = 2 ± 2√5     Exact solution

x = {-2.472, 6.472}    Decimal approximation

Step-by-step explanation:

x² - 4x + 4 = 20

Subtract 4 from both sides

x² - 4x = 16

Complete the square using half the x coefficient, (-4/2 = -2),  as the complete the square term

(x - 2)² = (-2)² + 16

(x - 2)² = 20

Take the square root of both sides

x - 2 = ±√20

x - 2 = ±2√5

Add 2 to both sides

x = 2 ± 2√5     Exact solution

x = {-2.472, 6.472}    Decimal approximation

---------------------

Note this could also be solved using the quadratic formula

egoroff_w [7]3 years ago
6 0

Answer:

6.472

Step-by-step explanation:

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3 years ago
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8 0
4 years ago
The midtown middle school cheerleaders earned $175 at a car wash. If this amount is 25% of the cost of a new set of uniforms, wh
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6 0
3 years ago
Read 2 more answers
5
Svetradugi [14.3K]

Answer:

The right answer is:

Option OB: f(1) = -9

Common difference: 7

Step-by-step explanation:

Given sequence is:

-9, -2, 5, 12,...

Here the first number is f(1)

Common Difference:

Common difference is the difference between consecutive terms of an arithmetic sequence. It is denoted by d.

In the given sequence,

f(1) = -9

f(2) = -2

f(3) = 5

d=f(2)-f(1) = -2-(-9) = -2+9 = 7\\d = f(3)-f(2) = 5-(-2) = 5+2 = 7

Hence,

The right answer is:

Option OB: f(1) = -9

Common difference: 7

7 0
3 years ago
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