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Whats the answer to thissssssssss???

Guest Apr 18, 2017
 #1
avatar+1510 
0

Wait what?

MysticalJaycat  Apr 18, 2017
 #5
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+1

x * (4x + 7) =480, solve for x

 

Solve for x:
x (4 x + 7) = 480

Expand out terms of the left hand side:
4 x^2 + 7 x = 480

Divide both sides by 4:
x^2 + (7 x)/4 = 120

Add 49/64 to both sides:
x^2 + (7 x)/4 + 49/64 = 7729/64

Write the left hand side as a square:
(x + 7/8)^2 = 7729/64

Take the square root of both sides:
x + 7/8 = sqrt(7729)/8 or x + 7/8 = -sqrt(7729)/8

Subtract 7/8 from both sides:
x = sqrt(7729)/8 - 7/8 or x + 7/8 = -sqrt(7729)/8

Subtract 7/8 from both sides:
Answer: | x = sqrt(7729)/8 - 7/8 =~10.11 inches.

Guest Apr 18, 2017
 #6
avatar+80 
+1

I think you are just a.) cheating on a test b.) cheating in your homework c.) cheating...period.

wgunningham  Apr 18, 2017
 #7
avatar+1510 
0

Lol           

MysticalJaycat  Apr 18, 2017

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