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If the quadratic function 3x2 - 7x + R is a perfe...

If the quadratic function 3x2 - 7x + R is a perfect square, find R

A.

4924

B.

4912

C.

4913

D.

493

E.

4936

Correct answer is B

3x2 - 7x + R. Computing the square, we have
x2 - 73 = -R3

(x176)2 = -R3 + 4936

R3 + 4936 = 0

R = 4936 x 31

= 4912