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Setler79 [48]
2 years ago
14

What is the positive solution to the equation 2x^2 = 72?

Mathematics
2 answers:
GaryK [48]2 years ago
7 0
2x^2=72
x^2=36
x=±6
x=6
x=-6
vagabundo [1.1K]2 years ago
4 0

Answer:

x= 6

Step-by-step explanation:

6*6=36*2=72

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(2x+3)²=5.find the roots of the equation ​
bija089 [108]

Answer:

-2.61803398875, -0.38196601125

or

(-3±√5)/2

Step-by-step explanation:

First, expand. (2x+3)² = 4x²+12x+9=5

4x²+12x+4 = 0

Quadratic equations take the form ax²+bx+c = 0

In this case,

a = 4

b = 12

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You can solve with the equation x=(-b±√b²-4ac)/2a

Plug in:

(-12±√144-64)/8

(-12±√80)/8

(-12±√2^4×5)/8

(-12±4√5)/8

(-3±√5)/2

Final answer x = (-3±√5)/2

If you want decimal form: -2.61803398875, -0.38196601125

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