Answer:
1.) x² -10x = 22
x²-10x - 22 = 0
x = -10 √(-10)² - 4x 1 (-22)
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2 x 1
x= 10√ 100 + 88
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2
x= 10 √ 188
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2
x= 10 2√47
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2
x= 10 - 2√47
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2
x= 5 +√47
x= 5 - √47
x1= 5- √47
x2= 5+√47
Or
x1= - 1. 855
x2= 11. 855
2.) 7r²-r+8=0
r= -1 √(-1)² - 4 x 7 x 8
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2 x 7
r= 1 +- √1 - 224
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14
r= 1 +- √ -223
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14
The expression is undefined in the set of real numbers
