(4x - t2)
= [(2√x)2 - t2] (This is now the difference of squares)
= (2√x - t)(2√x + t)
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n2 - 100t write t = (√t)2 = n2 - (10√t)2 = (n - 10√t)(n + 10√t)
15t2 squared-t-15t+3=15t squared-14t+3
28 t2 - 17 t - 3 = (7t + 1) x (4t - 3)
(t + 3)(t - 15)Ask yourself, what factors of - 45 add up to - 12 ?t = - 3t = 15
(the square root of 19 - t)(t + the square root of 19)