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amid [387]
2 years ago
8

The length of a rectangle is 3cm more than the width. The area is 70cm^2. Find the dimensions of the rectangle​

Mathematics
1 answer:
Rom4ik [11]2 years ago
7 0
Let width be x
Length would be x + 3
Area = L * W
Make an equation
(x) * (x+3) = 70
x^2 + 3x = 70
x^2 + 3x - 70 = 0
Quadratic formula
(-3 +/- rt 3^2 - 4 * 1 * (-70))/(2 * 1)
x1 = (-3 + 17)/2, x2 = (-3-17)/2
x = 7, x = -10
Dimension cannot be negative

Solution: width = 7
Length = 10
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Verizon [17]

If f(x) has an inverse on [a, b], then integrating by parts (take u = f(x) and dv = dx), we can show

\displaystyle \int_a^b f(x) \, dx = b f(b) - a f(a) - \int_{f(a)}^{f(b)} f^{-1}(x) \, dx

Let f(x) = \sqrt{1 + x^3}. Compute the inverse:

f\left(f^{-1}(x)\right) = \sqrt{1 + f^{-1}(x)^3} = x \implies f^{-1}(x) = \sqrt[3]{x^2-1}

and we immediately notice that f^{-1}(x+1)=\sqrt[3]{x^2+2x}.

So, we can write the given integral as

\displaystyle \int_0^2 f^{-1}(x+1) + f(x) \, dx

Splitting up terms and replacing x \to x-1 in the first integral, we get

\displaystyle \int_1^3 f^{-1}(x) \, dx + \int_0^2 f(x) \, dx = 2 f(2) - 0 f(0) = 2\times3+0\times1=\boxed{6}

7 0
1 year ago
Complete the ratio table below
adelina 88 [10]
The answer for 4 is 12..
hope it helps u..
have a great day ahead! :)
7 0
3 years ago
Read 2 more answers
Find the product of f(x)=3 and g(x)=x+7
DaniilM [7]
F(x)=3 domain: negative infinity, positive infinity range: 3

g(x)=x+7 domain: - infinity, + infinity range: - infinity, + infinity
8 0
2 years ago
What is the perimeter of an equilateral triangle pose area is 4 square root 3
Greeley [361]
P≈9.12
area 4                                               

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6 0
2 years ago
Read 2 more answers
Solve for v -7 v+3 = -63
denis23 [38]

Answer:

v = 66/7

Step-by-step explanation:

Step 1: Write equation

-7v + 3 = -63

Step 2: Solve for <em>v</em>

<u>Subtract 3 on both sides:</u> -7v = -66

<u>Divide both sides by -7:</u> v = 66/7

Step 3: Check

<em>Plug in x to verify if it's a solution.</em>

-7(66/7) + 3 = -63

-66 + 3 = -63

-63 = -63

8 0
3 years ago
Read 2 more answers
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