is the same as
. The 4s will cancel leaving you with
or
, your 3rd option.
Answer:
(2a + 1)(2a - 5)
Step-by-step explanation:
Given
4a² - 8a - 5
Consider the factors of the product of the coefficient of the a² term and the constant term which sum to give the coefficient of the a- term
product = 4 × - 5 = - 20 and sum = - 8
The factors are + 2 and - 10
Use these factors to split the a- term
4a² + 2a - 10a - 5 ( factor the first/second and third/fourth terms )
= 2a(2a + 1) - 5(2a + 1) ← factor out (2a + 1) from each term
= (2a + 1)(2a - 5)
Answer: 168
Step-by-step explanation: When your faced with a longer problem that involves some multiplication of positives and negatives, make sure you work the problem carefully from left to right.
So the first thing we want to do here is to
multiply -4 by 6 and that gives us -24.
Now bring down the (-7) and we have -24 (-7) which is 168.
So our answer is 168.
