The method of solving the equation (1 + x) ^ 2 = 1.44

The method of solving the equation (1 + x) ^ 2 = 1.44

(1+x)^2=1.44
Note that 1.44 = 1.2 ^ 2
Square root of the original equation:
1 + x = 1.2 or 1 + x = - 1.2
Ψ x = 0.2 or x = - 2.2

1-25% x = 1 / 4, be sure to write the process~

Move items, merge similar items, simplify, generally 1-25% x = 1 / 4
25%x =75%
x=3

The solution of the system x + y2 = 2x − Y3 = x + 2 is ()
A. x＝−1y＝−5B. x＝−5y＝1C. x＝−5y＝−1D. x＝5y＝−1

According to the meaning of the question: X − y = − 4, ① x + y = − 6, ②, ① + ②: 2x = - 10, that is, x = - 5; ① - ②: - 2Y = 2, that is, y = - 1, then the solution of the equations is x = − 5Y = − 1

On the solution of an equation
The above equation is: 4x + 7Y + C = 26
The following formula is: 5x + 9y + C + 32
close

4x＋7y＋c＝26 (1)
5x＋9y＋c＋32 (2)
(1) * 5 - (2) * 4
-Y + C = 2, so y = C-2, substituting (1) gives x = 10-2c
Note: substitution method can also be used, that is, the expression of y to X can be obtained through (1), and then substituted into (2)