Question

A) 1,47:0,7 B) 2,9:0,01. Va rog am nevoie pentru creșterea notei la test
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Answer 1

Răspuns:p. 212 #7, 8, 11, 15, 17, 18, 23, 26, 35, 38, 41, 43, 46, 47, 51, 54, 57, 60, 63, 66, 71, 72, 75, 76, 81, 87, 88, 95, 97

2x2 - 5x - 12 = 0.

(2x + 3)(x - 4) = 0.

2x + 3 = 0 or x - 4 = 0.

x = -3/2, or x = 4.

x2 - 9 = 0.

x2 = 9.

x = 3, or x = -3.

x2 + 7 = 0.

x2 = -7.

x = ± .

Note that  =  = , so the solutions are

x = ± , two complex numbers.