kak plisssssßs bantu kak no 20 , 23, 24

20) 5y^2 -23y -10 = 0
5y^2 -25y + 2y -10 = 0
(5y^2 -25y) + (2y - 10) = 0
5y (y -5) + 2( y -5) = 0
(5y + 2)( y -5) = 0
y = -2/5 atau y = 5
23) (x +6)^2 +3x = 0
x^2 +12x +36 +3x = 0
x^2 + 15x + 36 = 0
( x +12) ( x +3 ) = 0
x = -12 atau x = -3
24) (x +6)(x -2) = 3(x +10)
x^2 + 4x -12 = 3x + 30
x^2 + 4x -3x -12 -30 = 0
x^3 + x -42 = 0
( x +7)(x -6) = 0
x = -7 atau x = 6