a²-2a-15 factorise using suitable identity
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Answer:
a= -3 and a= 5
Step-by-step explanation:
a²-2a-15=0
a²-5a+3a-15=0
a(a-5)+3(a-5)=0
(a+3)(a-5)=0
when a+3=0
a= -3
when a-5=0
a= 5
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