Question

If one zero of the quadratic polynomial 2x² + kx - 15 is 3, then the other zero is :
(A) -15
(B) -15/2
(C) -5/2
(D) k

Answer 1

Answer:

answer is c -5/2

Step-by-step explanation:

if we put 3 in the equation we get the value of k as -1..so the equation is. ...

$2 {x}^{2} - x - 15 = 0 \\ 2 {x}^{2} - 6x + 5x - 15 = 0 \\ 2x(x - 3) + 5(x - 3) = 0 \\ (2x + 5)(x - 3) = 0 \\ x = - 5 \div 2 \: \: and - 3$

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