Question

10 x² + 72 x - 64 = 0

Answer 1

10x² + 72x - 64 = 0
a = 10, b = 72, c = -64
Δ = b² - 4 · a · c
Δ = 72² - 4 · 10 · (-64)
Δ = 5184 + 2560
Δ = 7744

X' = -b + √Δ / 2a
X' = -72 + √7744 / 2 · 10
X' = -72 + 88 / 20
X' = 16 / 20
X' = 1.6

X" = -b - √Δ / 2a
X" = -72 - 88 / 2 · 10
X" = -160 / 20
X" = -8

Answer 2

100x + 72x - 64 = 0
100x+72x=64
172x=64
X=64/172 (:2)
X=32/86 (:2)
X= 16/43