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dem82 [27]
2 years ago
7

How do i expand (3x+5)^2

Mathematics
2 answers:
shepuryov [24]2 years ago
8 0
I don't know how you expand it but the answer is 3x + 25 unless that's expanding.
alisha [4.7K]2 years ago
3 0
(3x + 5)^2 expands into two binomials: (3x + 5)(3x +5)

from there, you foil them:
(3x + 5)(3x + 5)
multiply the first terms ... 9x^2
the inside terms ... 9x^2 + 15x
outside terms ... 9x^2 + 15x + 15x
last terms ... 9x^2 + 15x + 15x + 25
then add like terms ... 9x^2 + 30x + 25

that's the expanded binomial!!
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The problem gives you both numbers, so all you have to do is multiply them.

Circumference = (pi) x (diameter) = (3.14) x (21cm) = <em>65.94 cm .</em>


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3 years ago
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Step-by-step explanation:

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Answer:

9x+4x^2-5y

Step-by-step explanation:

Hi there!

Length of the field: 14x-3x^2+2y units

Width of the field: 5x-7x^2+7y units

To find how much greater the length of the field is than the width, subtract the width from the length:

14x-3x^2+2y-(5x-7x^2+7y)

Open up the parentheses

= 14x-3x^2+2y-5x+7x^2-7y

Combine like terms

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Therefore, the length is 9x+4x^2-5y units greater than the width.

I hope this helps!

7 0
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