sir,solve this by factorisation: 4x2-115x+375

Asked by aarthi9 | 11th Nov, 2010, 01:42: PM

Expert Answer:

Dear Student,

The factors of 4×375 are 2,2,3,5,5,5. So the best combination, that sums up tp 115 is that of 3×5=15 and 2×2×5×5=100. Hence,

4x2 - 115x + 375

4x2 – 100x – 15x + 375

=> 4x (x-25) – 15 (x-25)

Taking out (x-25) common,

=> (x-25)(4x-15) = 0

=> (x-25) = 0 or (4x-15) = 0

=> x = 25, 15/4

Regards Topperlearning.

Answered by  | 11th Nov, 2010, 11:10: PM

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