Question:

Replace each k with a number so that the equations are perfect squares.?

by  |  earlier

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a)

4x^2 + kx + 25

b)

36x^2 – kx + 49

c)

16x^2 + kx + 9

d)

x^2 + kx + 100

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  1. a)

    4x^2 + kx + 25

    k^2/16 = 25 --> k = 20

    b)

    36x^2 – kx + 49

    k^2/36^2 = 49 --> k = 252

    c)

    16x^2 + kx + 9

    k^2/16^2 = 9 --> k = 144

    d)

    x^2 + kx + 100

    k^2/4 = 100 --> k = 20


  2. 2 * √coefficient x^2 term * √coefficient y^2 term
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