4 years ago

Use completing the square to solve for x in the equation (x+7)(x-9)=25

Mathematics

2 answers:

anygoal [31]4 years ago

7 0

X = 1 +- square-root 89

iren2701 [21]4 years ago

6 0

The answer will be C. x = 1 += $\sqrt{89}$

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The thrift store is selling their old DVDs. When the DVDs first came out, they sold for $19. They have now been marked down by 7

Luda [366]

Step-by-step explanation:

original price (100%) → $19

discounted price ((100-75)%) = (25%) → 25% x $19 = $4.75

8 0

3 years ago

Read 2 more answers

Factor the tribunal into two binomials than solve?

Vanyuwa [196]

Answer:

$(x-5)(x-3)=0$

$x=5 \text{ and } x=3$

Step-by-step explanation:

Quadratic Equation given:

$x^2-8x+15=0$

In order to factor this equation think that we'll have something in the format: $(x-a)(x-b)$

Once: -a -b = -c

and (-a)(-b)= d

Therefore, we have

$(x-5)(x-3)=0$

$x-5=0\\\text{or}\\x-3=0$

$x=5 \text{ and } x=3$

4 0

4 years ago

Let r vary directly with s and inversely with t. Which equation represents this equation? Assume that a is a constant.

andrew11 [14]

$\bf \qquad \qquad \textit{combined variation}
\\\\
\begin{array}{llll}
\textit{\underline{y} varies directly with \underline{x}}\\
\textit{and inversely with \underline{z}}
\end{array}\implies y=\cfrac{kx}{z}\impliedby 
\begin{array}{llll}
k=constant\ of\\
\qquad variation
\end{array}\\\\
-------------------------------\\\\
\stackrel{\textit{\underline{r} varies directly with \underline{s} and inversely with \underline{t}}}{r=\cfrac{ks}{t}\qquad \textit{ and since a = k}\qquad r=\cfrac{as}{t}}$