3 years ago

Plz answer i will really apreciate it :) 50 points

Mathematics

2 answers:

hoa [83]3 years ago

7 0

Answer:

b or c

Step-by-step explanation:

brilliants [131]3 years ago

7 0

Answer:

25 5/24

Step-by-step explanation:

13 7

11 5

= (13 + 11) + (

)

= 24 +

7 × 2

12 × 2

5 × 3

8 × 3

= 24 +

14 + 15

= 24 +

1 5

25 5

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sashaice [31]

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Solve x2 = 12x – 15 by completing the square. Which is the solution set of the equation? Solve x2 = 12x – 15 by completing the s

Svetlanka [38]

Answer: $6+\sqrt{21}\ \text{and}\ 6-\sqrt{21}$

Step-by-step explanation:

Given

Quadratic equation is

$x^2-12x+15=0$

Solving by completing the square method

$\Rightarrow x^2-2\cdot 6\cdot x+15=0\\\text{add and subtract 36}\\\Rightarrow x^2-2\cdot 6\cdot x+15+36-36=0\\\Rightarrow x^2-2\cdot 6\cdot x+36+(-36+15)=0\\\text{using}\ (a-b)^2=a^2+b^2-2ab\\\Rightarrow (x-6)^2-21=0\\\Rightarrow (x-6)^2=21\\\Rightarrow x-6=\pm \sqrt{21}\\\Rightarrow x=6\pm \sqrt{21}$