w^2 +/- 28w - 1 is an expression, not an equation. Expressions do not have solutions.
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100 V2 - 25 W2 = (10V + 5W) (10V - 5W)Another way to show it:100 V2 - 25 W2 = 25 (4 V2 - W2) = 25 (2V - W) (2V + W)
w2/(3w)2 = w2/9w2 = w2-2/9 = w0/9 = 1/9 or w2/3w2 = 1/3
(w + 9)(w + 9)
w x w + 6 = 135 w2 + 6w - 135 =0 Ie (w - 9)(w + 15) = 0 width = 9m (length = 15m)
Six less than a number w squared is written algebraically as w2 - 6