Question:

Solve by factoring, if possible?

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Problem #1:

21x²=13x+20

Problem #2:

4x²=5-19x

Problem #3:

35x²-11=7-27x

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  1. 1.

    21x^2 - 13x - 20 = 0

    (7x + 5)(3x - 4) = 0

    x = - 5 /  7 or 4 / 3.

    2.

    4x^2 + 19x - 5 = 0

    (4x - 1)(x + 5) = 0

    x = 1 / 4 or - 5.

    3.

    35x^2 + 27x - 18 = 0

    (5x + 6)(7x - 3) = 0

    x = - 6 / 5 or 3 / 7.

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