4 years ago

Please help me. Factor. 25x^2+90x+81

1 answer:

8 0

This is a special product factorization.
If the first term is a perfect square, the last term is a perfect square, and the middle term is twice the product of their square roots then you get the form
(a + b)^2.
SO....(5x + 9)^2 or (5x +9)(5x +9)

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3 years ago

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4 years ago

1/8 gram of copper and 1/3 of silicone is used to manufacture 30 headphones. how much silicone is used in each pair of headphone

FinnZ [79.3K]

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Step-by-step explanation:

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3 years ago

Solve this system of equations by any method.<br> 5x + y = -13<br> 4x + 3y= -17

irga5000 [103]

5x + y = -13.....multiply by -3
4x + 3y = -17
-----------------
-15x - 3y = 39 (result of multiplying by -3)
4x + 3y = -17
-----------------add
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x = -22/11
x = -2

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solution (-2,-3)

5 0

4 years ago

What is the area of the pentagon shown below a.27 square feet b. 58.5 c.85.5 d.117

Sergio [31]

Answer:

Option B, Area of pentagon = 58.5 Square feet

Step-by-step explanation:

The remaining part of the question is attached as image

Solution

Area of pentagon has a triangle and a trapezoid

Area of triangle = 0.5 *base *height = 0.5*9 *3 = 13.5 square feet

Area of trapezoid = Area of rectangle – 2* area of smaller triangles

= 9 ft * 6ft – ( 2 * 0.5 * 6 ft * (9 ft – 6ft) /2

= 54 – (1*6*1.5)

Area of pentagon = 13.5 + 45 = 58.5 Square feet

Hence, option B is correct

3 0

3 years ago