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yKpoI14uk [10]
3 years ago
5

Solve the quadratic equation by completing the square. x^2 - 10x + 18 = 0

Mathematics
1 answer:
serious [3.7K]3 years ago
3 0
Okay so basically, you subtract 18 on both sides since the 18 doesn't work, making the equation 
<span>x</span>²<span> - 10x = -18
So then you add (b/2)</span>²<span>, which is 25, to both sides, to get 
</span><span>x</span>²<span> - 10x + 25 = 7
</span><span>After this, you factor.
</span><span>(x-5)(x-5) = 7
</span><span>Then you simplify.
(x-5)</span>²<span> = 7
Then you solve for x.
</span>√(<span>x-5)</span>²<span> = </span>√7
x-5 = (+ or -)√7

~ x= 5 (+ or -)√7 ~

Hope this helps!

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