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A number is called a "solution" for an inequality if, when you plug that number into the variable, the inequality becomes true. For example, 4 is a solution to the inequality "x + 5 < 10", because when you plug in 4 for x, you get "4 + 5 < 10", which is true. (4 plus 5 is 9, which is less than 10.) On the other hand, 6 is not a solution to the inequality "x + 5 < 10", because when you plug in 6 for x, you get "6 + 5 < 10", which is false. (6 plus 5 is 11, which isn't less than 10.)
25*x^2 + 4 = 20*x 25*x^2 - 20*x + 4 = 0 25*x^2 - 10*x - 10*x + 4 = 0 5*x(5*x - 2) - 2* (5*x - 2) = 0 (5*x - 2)*(5*x - 2) = 0 or (5*x - 2)^2 = 0 5*x = 2 x = 2/5 or 0.4
4(x- 8) + 10 = -10
10-4=6
5 x 10-4 = 0.0005