Question

Solve each equation *

Captionless Image
a
b
c
d

Answer 1

b)

Explanation:

n²+n-42=0

Using mid-term break

n²+7n-6n-42=0

n(n+7)-6(n+7)=0

(n-6)(n+7)=0

Either,

n-6=0 OR n+7=0

n=6 OR n= -7