Which of the following is the correct factored form of the given equation?
4x2 - 25 = 0
(4x - 5)(x + 5) = 0
(2x - 5)(2x + 5) = 0
0 2(x - 5)² = 0

(2x-5)(2x+5)=0

Step-by-step explanation:

A^2 - B^2 =(A-B)(A+B)...(*)

4x^2 - 25 = 0

(2x)^2 - 5^2=0 (*)

(2x-5)(2x+5)=0

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18