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ICSE Class 10 Answered

solve the quadratic equation x squared minus 3 left parenthesis x plus 3 right parenthesis equals 0 give your answer correct to two significant figures
Asked by pradipdhole | 17 Jun, 2019, 07:55: PM
answered-by-expert Expert Answer
x2 - 3(x + 3) = 0
x2 - 3x - 9 = 0
Comparing with ax2 + bx + c = 0
a = 1, b = -3 and c = -9
b2 - 4ac = (-3)2 - 4 × 1 × (-9) 
             = 9 + 36
             = 45
begin mathsize 16px style straight x equals 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 space space space equals space fraction numerator 3 plus-or-minus square root of 45 over denominator 2 end fraction space space space equals space fraction numerator 3 plus-or-minus 3 square root of 5 over denominator 2 end fraction space space space equals space fraction numerator 3 plus-or-minus 3 cross times 2.23 over denominator 2 end fraction end style
x = 4.85 or -1.85
Answered by Sneha shidid | 18 Jun, 2019, 09:32: AM

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