Question

Find the zero of the quadratic polynomial 2x^2+x-15 and verify a relationship between the zero and it's coefficient.

Answer 1

Answer:

2x^2+x-15=0

x=-b_+√b^2-4ac/2a

=-1+-√1+4(2)(15)/2(2)

=-1+_√121/4

=-1+-11/4

x=-1+11/4. x=-1-11/4

x=10/4. x=-12/4

x=5/2. x=-3

2(5/2)^2+5/2-15=0. 2(-3)^2+(-3)-15=0

2(25/4)+5/2-15=0 18-3-15=0

25+5-30=0×2. 15-15=0

30-30=0. 0=0

0=0

Answer 2

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