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x + y = -b/a = -(-7)/1 = 7
x.y = c/a = 12/1 = 12
akar baru:
α = 2x dan β = 2y
α+β = 2x + 2y
= 2 (x + y)
= 2 (7)
= 14
α.β = (2x) (2y)
= 4xy
= 4(12)
= 48
persamaan kuadrat:
x² - (α+β)x + (α.β) = 0
x² - 14x + 48 = 0
semoga membantu ya :)