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How do I solve for x in these quadratic equation?

So i need to solve for X (without using the quadratic formula) in these two problems. first problem: 2(x-5)^2=12 and the other problem: 3(x+1)^2=10. How do I solve for x? thanks in advance =)

3 Answers

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  • 1 decade ago
    Favorite Answer

    Question #1

    2(x-5)^2 = 12

    2(x^2 - 10x + 25) = 12

    x^2 - 10x + 25 = 6

    x^2 - 10x + 19 = 0

    I don't know how to continue with this one without using the quadratic formula...

    Question #2

    3(x+1)^2 = 10

    3(x^2 + 2x + 1) = 10

    3x^2 + 6x - 9 = 0

    3(x^2 + 2x - 3) = 0

    3(x + 3)(x - 1) = 0

    x = -3, 1

    Hope this helps, and good luck!! :)

  • 1 decade ago

    2(x-5)^2=12

    2[x^2-10x +25]=12

    2 x^2-20x+50=12

    2 x^2-20x+38=0

    On factorization U will get decimal roots….

    Another approach is:

    (x-5)^2=6

    (x-5)=√6 or -√6

    X=(5+√6) or (5 -√6)(on simplifying these numbers will be decimals)

    2)3(x+1)^2=10

    Similar second approach:

    (x+1)^2=(10/3)

    (x+1)=√ (10/3) or -√(10/3)

    X= -1-√ (10/3) or-1 -√(10/3)

  • Anonymous
    1 decade ago

    cant say

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