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I need help on showing work but it can’t be substitution! :(

I need help on showing work but it can’t be substitution! :(-example-1
User Totoro
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1 Answer

4 votes

(x - 5)^2 = 81

x^2 - 10x + 25 = 81

x^2 - 10x -56 = 0

The equation of bhaskara is


x=\frac{-b\text{ }\pm\sqrt[]{b^2-4ac}}{2a}

In this case, we have, a = 1, b = -10 and c = -56

Therefore:


x_+=\frac{10\text{ +}\sqrt[]{100+4\cdot56}}{2}=14_{},x_-=\text{ }\frac{10-\sqrt[]{100+4\cdot56}}{2}=\text{ -4}

User Dkl
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7.3k points