solve this question by completing the square of algebraic expression?
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Answer:
X² - 10x +21 = 0
roots of 21 is - 7 and - 3
x² - 7x - 3x + 21 + =0
x(x - 7) - 3 ( x - 7) =0
( x - 3) ( x - 7 ) = 0
x - 3 = 0 OR x - 7 = 0
X = 3 or x = 7
The value of x is 3 or 7
hope it will help you
vasim@27
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=> x² - 10x + 21
=> x² - (7+3)x + 21
=> x² - 7x -3x + 21
=> x (x-7) - 3 (x-7)
=> (x-3) (x-7)
Hope it's Helpful for you.......
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