asked 165k views
0 votes
1. Rút gọn biểu thức A(x) = (x+2)(x+3)(x+5) - (x-1)(x+4)(x+7). Từ đó tìm tất cả các giá trị x sao cho A(x) = 0.

asked
User Tommz
by
8.1k points

2 Answers

2 votes

Answer:

778744

Explanation:

387t98878989890

answered
User CrimsonDark
by
7.3k points
5 votes

x = -29/7

Explanation:

A(x) = (x^2 + 5x + 6)(x + 5) - (x^2 + 3x - 4)(x + 7)

= (x^3 + 10x^2 + 31x + 30) - (x^3 + 10x^2 + 17x - 28) = 14x + 58

A(x) = 0 => 14x + 58 =0 => x = -58/14 = -29/7

answered
User Arno Hilke
by
8.4k points
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