Question

Match the trinomials with their factors.

Answer 1

A^2+a-20 is (a+5)(a-4)
Because 5-4 is 1 (1a- the middle term) and -4*5 is -20 (final term)
A^2-9a+20 is (a+4)(a+5)
A^2-8a-20 is (a-10)(a+2)
A^2-12a+20 is (a-10)(a-2)
A^2-19a-20 is (a-20)(a+1)
Hopefully you can use the first explanation as an example. Let me know if you need more help!