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Ilya [14]
3 years ago
13

What is the solution to the equation square root x2 + 2x - 25 = square root x + 5

Mathematics
1 answer:
Arturiano [62]3 years ago
7 0

Solutions to the equation are 5, -6

Step-by-step explanation:

  • Step 1: Equation is √(x² + 2x - 25) = √(x + 5). Square both sides to simplify the equation

⇒ x² + 2x - 25 = x + 5

⇒ x² + x - 30 = 0

⇒ x² + 6x - 5x - 30 = 0

⇒ x(x + 6) - 5(x + 6) = 0

⇒ (x - 5)(x + 6) = 0

⇒ x = 5, -6

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Answer:

Step-by-step explanation:

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What is the volume of a pyramid whose base is a square of area 36 and whose four faces are equilateral triangles?
irina1246 [14]

Answer:

V = 36\sqrt{2}

Step-by-step explanation:

The volume of a pyramid is

V = \dfrac{1}{3}Bh

where B = area of the base, and h = height of the pyramid

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A = s^2

s = \sqrt{A}

s = \sqrt{36}

s = 6

The side of the base has length 6. Each face of the pyramid is an equilateral triangle with side of length 6.

An altitude of this triangle measures

a = \sqrt{6^2 - 3^2}

a = \sqrt{27}

The pyramid is formed by 4 equilateral triangles whose bases form a square. The tips of the faces meet at a single point on top. The vertical distance from that point to the center of the base is the height of the pyramid.

h = \sqrt{(\sqrt{27})^2 - 3^2 }

h = \sqrt{27 - 9}

h = \sqrt{18}

h = 3 \sqrt{2}

Volume of the pyramid:

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V = 36\sqrt{2}

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