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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
- ∂µ¢кყLv 61 decade agoFavorite 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)=â6 or -â6
X=(5+â6) or (5 -â6)(on simplifying these numbers will be decimals)
2)3(x+1)^2=10
Similar second approach:
(x+1)^2=(10/3)
(x+1)=â (10/3) or -â(10/3)
X= -1-â (10/3) or-1 -â(10/3)
- Anonymous1 decade ago
cant say