Does each of the following result in X^2– 100? A (x-90) + (x – 10) B (x – 9)^2 – 19 C x(x – 100) D (x

Question

Does each of the following result in
X^2– 100?
A (x-90) + (x – 10)
B (x – 9)^2 – 19
C x(x – 100)
D (x + 10)(x – 10)

in progress 0
Lệ Thu 3 years 2021-07-29T17:19:21+00:00 1 Answers 3 views 0

Answers ( )

  1. quangkhai
    0
    2021-07-29T17:20:57+00:00
    Reply

    Answer :
    D – (x+10)(x-10)

    Solution:
    x^2 -100
    = x^2 – 10^2
    = (x+10)(x-10) { a^2 -b^2 = (a+b)(a-b)

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )