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3 years ago

14

Solve each equation mentally for x.

1 answer:

Basile [38]3 years ago

6 0

Use Cymath to find your answer.

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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

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

The solution set of the equation is $6+\sqrt{21}\ \text{and}\ 6-\sqrt{21}$

6 0

3 years ago

Read 2 more answers

identify a pattern in the given list of numbers. then use this pattern to find the next number. 1,5,1,10,1,20,1

saw5 [17]

40 the answer is 40. It’s very easy

5 0

3 years ago

Please help me plssssssssssssssssssssss

oksian1 [2.3K]

Problem 7

(45 pages)/(90 min) = 1/2 page per min, i.e. 1 page per 2 minutes

(60 pages)(120 min) = 1/2 page per min

Both lead to the same result, so yes they are proportional.

Their reading speed is identical.

<h3>Answer: True</h3>

7 0

2 years ago

Read 2 more answers

Simplify. <img src="https://tex.z-dn.net/?f=%5Csqrt%7B15%7D" id="TexFormula1" title="\sqrt{15}" alt="\sqrt{15}" align="absmiddle

jolli1 [7]

Answer:

I think its 15.58

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

P=R-C<br><br> Solve the formula for C

Anit [1.1K]

P = R - C

R - C = P

- C = P - R

Multiply both sides by - 1

-C*-1 = -1*(P - R)

C = -P + R

C = R - P

4 0

3 years ago