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1 January, 16:53

4. Solve the quadratic by factoring, isolating x^2, or using the quadratic formula:

a. 2x^2 - 7x = 4

b. 81x^4 - 1

c. 2x^2 - 32 = 0

d. X^2 - 7x + 12

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Answers (1)
  1. 1 January, 17:15
    0
    Hello,

    A:

    2x²-7x-4=0

    ==>2x²-8x+x-4=0

    ==>2x (x-4) + 1 (x-4) = 0

    ==> (x-4) (2x+1) = 0

    ==> (x=4) or (x=-1/2)

    B: where is the sign "="!

    81x^-1 = (9x²+1) (3x+1) (3x-1) I can not go any further.

    C)

    2x²-32=0

    ==>x²-16=0

    ==> (x+4) (x-4) 0

    ==>x=-4 or x=4

    D:

    where is the sign "="!

    x^2-7x+12 = (x-4) (x-3) but I can not go ant further ...
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