2a(a– 5) + 4(a – 5)

Would like to make sure my answer is in the correct processing order to simplify expression to receive the correct answer for my homework. Thanks this is how I worked out the equation below: 2a(a– 5) + 4(a – 5) 2a - 10a + 4a - 20a 12a + 24a 36a Answer: 12a
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1 Answer

2a2-10a+4a-20 after distributing. Or factorise: (2a+4)(a-5)=2(a+2)(a-5).

This simplifies: 2a2-6a-20 which factorises: 2(a-5)(a+2) (the zeroes are 5 and -2)

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