Question

Solve and check the followig
explosion.21X- 31-8​

Answer 1

• SOLVING

21x² - 31x + 8 = 0

21x² - 7x - 24x + 8 = 0

7x ( 3x - 1 ) - 8 ( 3x - 1 ) = 0

( 3x - 1 ) ( 7x - 8 ) = 0

x = 1/3 , 8/7

• CHECKING

21 ( 1/3 ) ² - 31 x 1/3 + 8 = 0

7/3 - 31/ 3 + 24/3 = 0

31/3 - 31/3 = 0

0 = 0

Hence checked

Answer 2

⊰᯽⊱┈──╌❊ 21x²-31x+8=0

21x²-7x-24+8=0

7x(3x-1)-8(3x-1)=0

(3x-1)(7x-8)=0

X=1/3, 8/7 ❊╌──┈⊰᯽⊱