Question

solve 7x²-5x-3=0 plz guys yar​

Answer 1

Step-by-step explanation:

7x² - 5x - 3 = 0

=> a = 7, b = -5 and c = -3

x = [- b ± √b² - 4ac]/2a

x = [-(-5) ± √{(-5)² - 4*7*(-3)}] / 2*7

x = [5 ± √(25 + 84)] / 14

x = [5 ± √109] / 14

therefore two roots are,

x = (5 + √109) / 14 and x = (5 - √109) / 14 [ CBSE ]

x = (5 + 10.44) / 14 => 1.1 [ ICSE solution ]

x = (5 - 10.44) / 14 => - 0.34 [ ICSE solution ]