Factor completely

Question

3 years ago

8

+20x-7" align="absmiddle" class="latex-formula">
Please show all workings

2 answers:

lisov135 [29] · Answer 1 · 2022-06-09T05:40:09+03:00

<h2><u>Explanation</u><u>:</u><u>-</u></h2>

First Method: (By splitting the middle term)

We have to find p and q such that p+q = 20 and

pq = 3×(-7) = -21

Let us looks for the pair of factors of -21 such that their sum is 20 and product is -21.

20 = 21 - 1 and -21 = 3(-7)

∴ 3x² + 20x - 7 = 3x² + 21x - 1x - 7

= 3x(x + 7) -1(x + 7)

= (x + 7)(3x - 1)

Second method: (Using the factor theorem)

mel-nik [20] · Answer 2 · 2022-06-09T03:40:18+03:00

7 0

Answer:

Step-by-step explanation:

<u>See the steps below:</u>