2 years ago

Using the Quadratic Formula, which of the following is the solution to the quadratic equation x2 - 3x - 28 = 0?

Mathematics

2 answers:

algol132 years ago

8 0

The answer is (x+7)(x-4)

hence, the solution should be C

Vinvika [58]2 years ago

8 0

x = [ -)-3) +/- sqrt((-3)^2 - 4*1*-28) ] / 2

= (3 + sqrt 121) / 2 and (3 - sqrt 121) / 2

= 3/2 + 11/2 and 3/2 - 11/

= (1.5 + 5.5) and 1.5 - 5.5

Answer is 7, -4

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