the factor of x2-4x-21
Answers
Answered by
1
Answer:
Summary: The factors of the given quadratic equation x2 - 4x - 21 = 0 are (x + 3) and(x - 7).
Step-by-step explanation:
was this answer helpful?
add this as brainly list
Answered by
0
Answer:
Step-by-step explanation:
x2 - 4x - 21 = 0 is in the form of ax2 + bx + c = 0
Now solving the equation by factorising
x2 - 4x - 21 = 0
For factorising first split the middle term - 4x as - 7x and + 3x as -7x + 3x
= - 4x and (-7x) (3x) = - 21 x2
⇒ x2 - 7x + 3x - 21 = 0
⇒ x(x - 7) + 3(x - 7) = 0
⇒ (x + 3) (x - 7) = 0 (ANS)
Similar questions