There's nothing to solve. If it equaled something, you could solve it. For example, if x^2 - 28 = 0, then x = the square root of 28, which simplifies to plus or minus 2 times the square root of 7.
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Youcannot solve an expression: you need an equation (or inequality) before it can be solved.
Solve this problem -x squared -40x- 80 =0
28^2 (28 x 28) is equal to 784.
If X squared is less than 16, then the absolute value of X is less than the square root of 16. X will be greater than -4 and less than +4.
You fill in for x and solve the equation3(5)^2 - 2(5)15^2 - 10; now solve
If that's x2 times 20 = 0, then x = 0, because only 0 x 20 = 0