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3 years ago

What are the solutions of the equation: x2 – 1 = 15?

Mathematics

1 answer:

ankoles [38]3 years ago

8 0

Answer:

x = ± 4

Step-by-step explanation:

Given

x² - 1 = 15 ( add 1 to both sides )

x² = 16 ( take the square root of both sides )

x = ± $\sqrt{16}$ = ± 4

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PLZZ HURRY q1) Simplify. 6(5p^3 − 6p)

AlexFokin [52]

Answer:

30p^3−36p

Step-by-step explanation:

6(5p^3−6p)

=(6)(5p^3+−6p)

=(6)(5p^3)+(6)(−6p)

=30p3−36p

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3 years ago

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What is 4 to the 2/3 power

Anna11 [10]

$\bf a^{\frac{{ n}}{{ m}}} \implies \sqrt[{ m}]{a^{ n}} \qquad \qquad
\sqrt[{ m}]{a^{ n}}\implies a^{\frac{{ n}}{{ m}}}\\\\
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4 years ago

A line is drawn through (–7, 11) and (8, –9). The equation y – 11 = y minus 11 equals StartFraction negative 4 Over 3 EndFractio

Arturiano [62]

Answer:

The answer is A) y = -4/3x + 5/3 and D) 4x + 3y = 5

Step-by-step explanation:

I got this answer right on edge

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3 years ago

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B=? Angle A=? Angle B=?

babunello [35]

1.) Solve for length b.

The simpler method is to use the Pythagorean theorem. If $a^2 - b^2 = c^2$ , then this means that $c^2 - a^2 = b^2$ .

Plug in the values:

$11^2 - 7^2 = b^2$

--> $121 - 49 = 72$

So this means that b is the square root of 72, which is 8.49

2.) Solve for ∠A.

Let's refer to the law of sines. If $\frac{a}{sin(A)} = \frac{c}{sin(C)}$ , then this means we can cross multiply. Since A is the value we are solving for, the equation should be written out like this:

$A = sin^-1(\frac{sin(C) * a}{c})$

--> $A = sin^-1(\frac{sin(90) * 7}{11})$

A is 39.52°

3.) Solve for ∠B.

This is the easiest one. The sum of all three angle measures in a triangle add up to 180°. We already know that one of the angles is a right angle and the other 39.52°.

39.52 + 90 = 129.52

180 - 129.52 = 50.48

∠B is 50.48°.

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3 years ago

The formula for the volume v of a regular dodecahedron (a solid with 12 regular pentagons as faces) is v =7.66a^3 where a is the

jonny [76]

Answer:

Volume = 7.66* side^3

side^3 = Volume / 7.66

side^3 = 30 / 7.66

side^3 = 3.9164490862

side = 1.5762707925

side = 1.58 feet (rounded)

Step-by-step explanation:

4 0

3 years ago