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Neko [114]
3 years ago
10

Solve x^2+12x=-11by completing the square which is the solution set of the equation A={-11,-1} B={-11,1} C={11,-1} D={11,1}

Mathematics
2 answers:
harkovskaia [24]3 years ago
8 0

Answer:

-11 and -1

Step-by-step explanation:

x² + 12x = -11

x² + 12x + 36 = -11 + 36

(x+6)² = 25

x + 6 = √25

x + 6 = 5

x = 5 - 6

x = -1

x+6 = -5

x = -11

Musya8 [376]3 years ago
4 0

Answer:B

Step-by-step explanation:

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garri49 [273]
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4 0
3 years ago
What is the area of this composite figure?
Gelneren [198K]

Answer:

249 centimeters squared

Step-by-step Explanation:

The area of the rectangle: l x w, where l is the length and w is the width.

= 15.5 x 18

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Area of the smaller rectangle: l x w, where l is the length and w is the width.

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Area of the shaded region:

= 279 - 30

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2 years ago
22
Lelu [443]

Answer:

13 and 7

Step-by-step explanation:

4 0
3 years ago
in the xy-plane, the line x + y=k, where k is a constant, is tangent to the graph of y=x^2+3x+1. What is the value of k?
Sholpan [36]
When a line and a curve are tangent to each other, they are joined together by 1 point (x,y). So, you equate both equations either in terms of x or y. For this problem, let's equate in terms of y.

y = k - x
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k - x = x² + 3x + 1
k = x² + 3x + x + 1
k = x² + 4x + 1

This would be the value of k. Since we are not given the common point, it can only be expressed in terms of x or y.
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3 years ago
Simplify the following expression: NEED HELP QUICK PLZ :(
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The answer is B

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