find the roots of the following quadratic equation by factorisation :2xsquare-17x+21=0
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Step-by-step explanation:
2x^2 - 17x + 21 = 0
Factors of given Q.E. (21 × 2) = 42 = 14 & 3
2x^2 - 14x - 3x + 21 = 0
2x(x - 7) -3(x - 7) = 0
(x - 7)(2x - 3) = 0
x - 7 = 0 & 2x - 3 = 0
x = 7 & x = 3/2
These are the roots of given Q.E.
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