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Q: What value makes c a perfect square 4x2 plus 20x plus c?

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16

49

49

81.

26

144

(b/2)^2= 64

38

64

16 does that.

48

-12

121

16? using 16, you have (3x2 + 4)(3x2 + 4) = 9x2 + 24x + 16

64

27

The given quadratic expression can not be factored as a perfect square.

x2 + 22x + 121 to get this divide 22 by 2... then square the answer you get from that 22/2 = 11 112 = 121

No.

No, consider 16 + 25 ...

The idea is to take half the coefficient of the linear term (in this case, of 24), and square it. This will be the value for "c".

false!

No

Only if the value of c is 9 because:- 4x2+12x+9 = (2x+3)(2x+3)

yes