Best Answer

a2+16 cannot be factored. There are no two numbers whose product is 16 and whose sum is 0.

Q: How do you factorise a2 plus 16?

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4y2+16y+16=0 Divide by 4 on both sides: y2+4y+4=0 Factorise: (y+2)(y+2)=0 Therefore y= -2