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3 years ago

What should you do first in solving this equation? x2 + 6x - 13 = 3

Mathematics

2 answers:

Svetradugi [14.3K]3 years ago

3 0

Answer:

x = 2

Step-by-step explanation:

x2 + 6x - 13 = 3

first you add 13 to other side and get

x2 + 6x = 16

next you combine x's

8x = 16

then you divde the 8x by 16

and you get x = 2

Maurinko [17]3 years ago

3 0

Answer: Subtracting the 13 from both sides of the equation.

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Rewrite the expression $6j^2 - 4j 12$ in the form $c(j p)^2 q$, where $c$, $p$, and $q$ are constants. What is $\frac{q}{p}$

solniwko [45]

$Rewrite the expression 6j^2 - 4j + 12$ in the form $c(j + p)^2 + q$, where $c$, $p$, and $q$ are constants. What is $\frac{q}{p}$$

The ratio of $\frac{q}{p}$ = - 34

How to solve such questions?

Such Questions can be easily solved just by some Algebraic manipulations and simplifications. We just try to make our expression in the form which question asks us. This is the best method to solve such questions as it will definitely lead us to correct answers. One such method is completing the square method.

Completing the square is a method that is used for converting a quadratic expression of the form $ax^{2} + bx + c$ to the vertex form

$a(x - h)^{2} + k$ . The most common application of completing the square is in solving a quadratic equation. This can be done by rearranging the expression obtained after completing the square: $a(x + m)^{2} + n$ , such that the left side is a perfect square trinomial

$6j^2 - 4j +12$

= $6(j^2 - \frac{2}{3} j )+12$

= $$6(j^2 - \frac{2}{3} j + \frac{1}{9} )+\frac{102}{9}$ (Completing Square method)

= $6( j- \frac{1}{3} )^{2} + \frac{34}{3}$

On comparing with the given equation we get

p = - $\frac{1}{3}$ and q = $\frac{34}{3}$

∴ $\frac{q}{p}$ = $\frac{\frac{34}{3} }{\frac{-1}{3} }$

= - 34

Learn more about completing the square method here :

brainly.com/question/26107616

#SPJ4

7 0

2 years ago

Solve -21 = -9 + 2/3b

Svet_ta [14]

Final Answer: $b = -18$

Steps/Reasons/Explanation:

Question: Solve $-21 = -9 + \frac{2}{3}b$ .

Step 1: Simplify $\frac{2}{3}b$ to $\frac{2b}{3}$ .

$-21 = -9 + \frac{2b}{3}$

Step 2: Regroup terms.

$-21 = \frac{2b}{3} - 9$

Step 3: Add $9$ to both sides.

$-21 + 9 = \frac{2b}{3}$

Step 4: Simplify $-21 + 9$ to $-12$ .

$-12 = \frac{2b}{3}$

Step 5: Multiply both sides by $3$ .

$-12$ × $3 = 2b$

Step 6: Simplify $-12$ × $3$ to $-36$ .

$-36 = 2b$

Step 7: Divide both sides by $2$ .

$-\frac{36}{2} = b$

Step 8: Simplify $-\frac{36}{2}$ to $-18$ .

$-18 = b$

Step 9: Switch sides.

$b = -18$

~I hope I helped you :)~

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4 years ago

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pychu [463]

Answer:

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2 years ago

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Katen [24]

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