Question

Find solution by using identity
a ²-23a +42​

Answer 1

Ans:

a^2-23+42=O

a^2-2a-21a+42=O

a(a-2)-21(a-2)=O

(a-2)(a-21)=O

.'.a=2 or 21.

Answer 2

Answer:

a²-23a+42=0

a²-2a-21a+42=0

a(a-2)-21(a-2)=0

(a-2)(a-21)=0

a-2=0 or a-21=0

a=2 or a=21