Find the roots by factorisation method. x² +10x+21=0
Answers
Answered by
1
Step-by-step explanation:
The given quadratic equation is
x² - 10x + 21 = 0.
x² - 10x + 21 = 0
⇒ x² - 7x - 3x + 21 = 0
⇒ x ( x - 7 ) - 3 ( x - 7 ) = 0
⇒ ( x - 7 ) ( x - 3 ) = 0
⇒ x - 7 = 0 or x - 3 = 0
Answered by
0
Answer:
x=62
Step-by-step explanation:
x^2 +10+21=0
=x^2 +31=0
=x^2=31+0
=x=31×2
=x=62
hope this is helpful
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