Help,, I'm asking for a friend XDD 5x³ + 2x² -20x - 8 = 0

Mathematics

2 answers:

Ulleksa [173]3 years ago

8 0

The answer is x
=
−
2
5
,
±
2
x=−
5

2
,±

NISA [10]3 years ago

5 0

Answer:

x=−2 or x= −2/5 or x=2

Explanation:

Let's solve your equation step-by-step.

5x3+2x2−20x−8=0

Step 1: Factor left side of equation.

(x+2)(5x+2)(x−2)=0

Step 2: Set factors equal to 0.

x+2=0 or 5x+2=0 or x−2=0

x=−2 or x=−2/5 or x=2

I have no idea if this is right- I used an equations calculator.

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Which of the following functions gives the length of the base edge, a(v), of a right square pyramid that is 8 inches tall as a f

Reil [10]

Answer:

$\large\boxed{a(V)=\sqrt{\dfrac{3V}{8}}}$

Step-by-step explanation:

The formula of a volume of a square pyramid:

$V=\dfrac{1}{3}a^2h$

a - base edge

h - height of a pyramid

We have H = 8in.

Substitute and solve for a:

$\dfrac{1}{3}a^2(8)=V\\\\\dfrac{8}{3}a^2=V\qquad\text{multiply both sides by}\ \dfrac{3}{8}\\\\\dfrac{3\!\!\!\!\diagup^1}{8\!\!\!\!\diagup_1}\cdot\dfrac{8\!\!\!\!\diagup^1}{3\!\!\!\!\diagup_1}a^2=\dfrac{3}{8}V\\\\a^2=\dfrac{3V}{8}\Rightarrow a=\sqrt{\dfrac{3V}{8}}$