Nomer 3 dong, ada yg bisa ga?pke cara ya

a + b = -(-3)/1 = 3
a . b = -5/1 = -5
persamaan kuadrat baru
x² - (2a+2b)x + (2a.2b) = 0
x² - 2(a+b)x + 4(a.b) = 0
x² - 2(3)x + 4(-5) = 0
x² - 6x - 20 = 0