Lição de Matemática

a) x(x+3)-40=0
b)10 + x(x - 2) = 2
c)4 + x(x - 4) = x
d) (x - 1) (x + 5) = 7
e)(x + 5) (x - 3) - x = 5
f)(x - 3)² = 16
g) (2x - 3)² = 25

h) (2x - 1)² = (x + 5)²

As formulas !!!!!

▲ = b² - 4 . a . c

b² (+ ou -) √▲

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2.a

Leh!!