Question

5x²+13x+8=0 Solve using formula.

Answer 1

Hi ,

Compare 5x² + 13x + 8 = 0 with ax²+bx+c=0

we get

a = 5 , b = 13 , c = 8

discreaminant ( D ) = b² - 4ac

D = 13² - 4 × 5 × 8

= 169 - 160

= 9

By using Quadratic formula ,

x = [ ( - b ) ± √D ]/2a

= [ ( - 13 ) ± √9 ]/( 2 × 5 )

= ( -13 ± 3 )/10

Therefore ,

x = ( -13 + 3 )/10 or x = ( -13 - 3 )/10

x = 1 or x = -8/5
I hope this helps you.

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