How do you solve n^2 - 7n = 0 by factoring?

3 Answers
Apr 13, 2018

n=0 or n=7

Explanation:

n^2 -7n = 0

n(n-7)=0

To equal zero, either n or (n-7) must be equal to zero

If n=0:
color(red)(n=0)

If (n-7)=0
color(red)(n=7)

Apr 13, 2018

n=0" or "n=7

Explanation:

"take out a "color(blue)"common factor "n

rArrn(n-7)=0

"equate each factor to zero and solve for n"

rArrn=0

n-7=0rArrn=7

Apr 13, 2018

n=0, n=7

Explanation:

Factorising:

n^2-7n -> n(n-7)

Set each bracket/term equal to 0:

n=0

n-7=0

-> n=7