Question

Find the roots of the quadratic equation X square - 9 X + 20 equal to zero

Answer 1

Answer:

x² - 9x + 20 = 0

x² - 5x - 4x + 20 = 0

x (x-5) -4 (x-5) = 0

x=5,4

zeroes are 5 and 4

Answer 2

here is your solution

==> x² - 9x + 20 = 0


==> x² - (4 + 5 )x + 20 = 0

==> x² - 4x - 5x + 20 = 0

==> x( x - 4 ) - 5(x - 4 ) = 0

==> ( x - 5 ) ( x - 4 ) = 0

==> x = 5 , 4 .

hope its helpful.