Solve: 4x² = 32

A. x = 4
B. x = ±8
C. x = ± √4
D. x = ± √8

D

Step-by-step explanation:

4x²= 32

x²= 32 ÷4 (÷4 on both sides)

x²= 8

x= ±√8 (square root bith sides)

☆ A '±' symbol has to be added whenever we introduce a square root as the square of any number, positive or negative, would result in a positive number.

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

the answer is 99.