cocobelle cocobelle

15-02-2019
Mathematics

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hellpppppp fast thanks plz What is the sum of the roots in this equation 2x^2+5x-3=0 A. -3.5 B. -2.5 C. -1.5 D. 2.5

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hroscoe hroscoe

15-02-2019

2x^2 + 5x -3 = 0 can be factored as:
(2x - 1)(x + 3) = 0; to find roots, set each set of parentheses equal to zero;
2x - 1 = 0; 2x = 1, so x = 1/2 = ROOT 1
x + 3 = 0, so x = -3 = ROOT 2
Now add the roots: -3 + 1/2 = - 2 1/2, so the answer is B.

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