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CBSE Class 10 Answered

how to factorise x^2-15x-3000  
Asked by shansonu | 22 Jul, 2019, 09:00: PM
answered-by-expert Expert Answer
The question should be like this how to factorise x2 - 15x - 30
Comparing with ax2 + bx + c we get a = 1, b = -15 and c = -30
Using formula
x = begin mathsize 16px style fraction numerator negative straight b plus-or-minus square root of straight b squared minus 4 ac end root over denominator 2 straight a end fraction equals fraction numerator begin display style 15 plus-or-minus square root of 15 squared minus 4 cross times 1 cross times open parentheses negative 30 close parentheses end root end style over denominator begin display style 2 end style end fraction equals fraction numerator 15 plus-or-minus square root of 345 over denominator 2 end fraction equals fraction numerator begin display style 15 plus-or-minus square root of 345 end style over denominator begin display style 2 end style end fraction end style
Answered by Sneha shidid | 23 Jul, 2019, 05:49: PM

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