(a) x² + 2x + 3 = 0
(b) 5x² - 4x - 2 = 0
(c) 2x² + 7x + 2 = 0
(d) 4x² = 5x - 21
(e) 2x² + 5x - 3 = 0
(f) 3x² + 8x + 2 = 0
(g) 7x² - 28x + 15 = 0
(h) 5x² + 12x + 3 = 0
(i) 2x² 3x - 4 = 0
(j) x² - 12x + 36 = 0
Show your working as done in exam format.
2007-08-05 18:09:21 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
why should i show my working as in an exam???
(a) x² + 2x + 3 = 0
x= ( -2 +- sqrt( 4 -4(3)) )/2 so there are no solutions.
(j) x² - 12x + 36 = 0
x = ( 12 +- sqrt( 144 - 4 (36) ) )/2
= ( 12 +- 0)/2
= 6.
2007-08-09 15:38:13 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Here is the explanation
http://mathworld.wolfram.com/QuadraticEquation.html
and here is the program for solving QE
http://www.akiti.ca/Quad2Deg.html
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2007-08-06 01:24:04 · answer #2 · answered by oregfiu 7 · 1⤊ 0⤋