# What is the solution set of 2x to the 2nd power -x-15 equals 0?

2x2 - x - 15 = 0 (2x + 5) (x - 3) = 0 [2x + 5 = 0] and [x - 3 = 0] x = -5/2 and x = 3 {-2.5, 3}

2x2 - x - 15 = 0 (2x + 5) (x - 3) = 0 [2x + 5 = 0] and [x - 3 = 0] x = -5/2 and x = 3 {-2.5, 3}

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x3 - 3x2 - 28x = x (x2 - 3x - 28) = x (x - 7) (x + 4) The numerical value of all this, of course, depends on the value of 'x', and it can change in a flash whenever the value… Continue reading

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3x2 = 21 describes two single values, and does not have an x intercept. 3x2 = 21 ∴ x2 = 7 ∴ x = ±√7

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x2 - 16 + 64 = x2 + 48, which does not have real factors.