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10 July, 05:36

Solve the Quadratics:

1) k^2-8k=0

2) a^2+5a=0

3) 6n^2+5n-25=0

4) 2x^2-11x-21=0

5) 2n^2+13n+19=4

Bonus Word Problem:

The larger leg of a right triangle is 7cm longer than its smaller leg. The hypotenuse is 8cm longer than the small leg. How many centimeters long is the smaller leg?

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Answers (1)
  1. 10 July, 06:23
    0
    Step-by-step explanation:

    1) k²-8k = 0

    k (k-8) = 0

    k = 0 or k=8

    2) a²+5a=0

    a (a+5) = 0

    a=0 or a = - 5

    3) 6n²+5n-25=0

    delta = b²-4ac b = 5 and a = 6 and c = - 25

    delta = 5²-4 (6) (-25) = 625 = 25²

    n 1 = (-5+25) / 12 = 20/12 = 5/3

    n 2 = (-5-25) / 12 = - 30/12 = - 5/2

    same method for 4) and 5)
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