Question

Solve the following equations, justifying each step by referring to an appropriate property or theorem. (a) 2x + 5 = 8, (c) x2 - I = 3, (b) x2 = 2x, (d) (x - l ) (x + 2) = 0.


Memecahkan persamaan berikut, membenarkan setiap langkah dengan merujuk ke properti yang sesuai atau
dalil.
(a) 2x + 5 = 8,
(c) x2 - 1 = 3,
(b) x2 = 2x,
(d) (x - 1) (x + 2) = 0.

Tolong bantuin ya abg and kakak

Answer 1

A) 2x + 5 = 8
2x = 8 - 5
2x = 3
x = 3/2

b) x² = 2x
x² - 2x = 0
x (x - 2) = 0
x = 0 atau x = 2

c) x² - 1 = 3
x² - 1 - 3 = 0
x² - 4 = 0
(x - 2) (x + 2) = 0
x = 2 atau x = -2

d) (x - 1) (x + 2) = 0
x = 1 atau x = -2