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.
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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