Question

use the formula method to solve the equation 21x^2+17x-250=0

Answer 1

-(17)+-sqrt (17)^2 -4(21)(-250)/2(21) then simplify and answer

Answer 2

21x^2 + 17x - 250 = 0

Using the quadratic formula we get:

x = (- 17 ± √ [17^2 + 4(21)(250)])/42

=> x = ( -17 ± √ 21289)/42

i.e. x = 3.07

so, total time is 4x + 2 = 14.3 seconds