Solve by using the quadratic formula. 5x^2+5x=3

a. -5+-square root 85 over 10

b. -5+-square root 85 over 5

c. -5+-square root 40 over 5

d. -5+-square root 40 over 10

5

Feb

Feb

Posted by Admin in Saturday, February 5th 2011 2 comments already

Solve by using the quadratic formula. 5x^2+5x=3

a. -5+-square root 85 over 10

b. -5+-square root 85 over 5

c. -5+-square root 40 over 5

d. -5+-square root 40 over 10

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numbr1TXfan Said,

February 5th, 2011 @11:44 pm

first set it equal to 0

5x^2+5x-3

x= -5 +/- square root of 5^2-4(5)(-3)/ 2(5)

x= -5 +/- suare root of 25+60/ 10

” ” 85/10

looks like A!

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5x^2+5x=3

5x^2 + 5x – 3 = 0

using the quadratic formula, we let a=5, b=5, c=-3

then x = { -5 +- [5^2 - 4 * 5 * (-3)]^(1/2) } / (2 *5)

= { -5 +- [25 + 60]^(1/2) } / 10

= { -5 +- [85]^(1/2) } / 10

the answer is a