SOLUTION: Solve using the quadratic formula: 20 = 2(2a - 5)squared + 8 Quadratic formula: -b +- radical b squared

SOLUTION: Solve using the quadratic formula: 20 = 2(2a - 5)squared + 8 Quadratic formula: -b +- radical b squared - 4ac over 2a

Question 640695: Solve using the quadratic formula: 20 = 2(2a - 5)squared + 8
Quadratic formula: -b +- radical b squared - 4ac over 2a
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

... Temporarily replace 'a' with 'x' (you'll see why below)

Now use the quadratic formula to solve for x

is in the form . So...

a = 8

b = -40

c = 38

Plug this into the quadratic formula

or

or

or

or

Note: The last solutions above are approximate

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So the exact solutions are or

and the approximate solutions are or

Note: remember to replace 'x' with 'a'
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