Question

(x + 7) • (-x + 11) = 0

Answer 1

(x + 7) • (-x + 11) = 0
-x²+11x-7x+77= 0
-x²+4x+77= 0
Δ= b²-4ac
Δ= 4²-4.(-1).77
Δ= 16+308
Δ= 324

-4+ 18 /2 . (-1)= 14/-2= -7
-4-18/-2 = -22/-2 = 11

Answer 2

Oi 

(x + 7)*(-x + 11) = 0

zerar cada termo

x + 7 = 0
x = -7

-x + 11 = 0
x = 11

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