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p+q = -b/a
pq = c/a
Persamaan kuadrat 2x²+3x-7=0 memiliki akar p dan q, maka
p+q = -3/2
pq = -7/2
Persamaan kuadrat baru dengan akar 4p dan 4q
x² - (4p + 4q)x + 4p . 4q = 0
x² - 4(p + q)x + 16pq = 0
x² - 4(-3/2)x + 16(-7/2) = 0
x² + 6x - 56 = 0
Persamaan kuadrat yang baru adalah x² + 6x - 56 = 0