Question

( у – 4)(у – 5)
(х – 3)(х2 + 2х – 6)
(3а + 2b)(5а – b)

Answer 1

(y-4)(y-5)=0
y²-5y-4y+20=0
y²-9y+20=0

Δ= 81-4*1*20=81-80 = 1
√Δ=1

x(1/2) = 5;4