Question

factorise 4a²+4a-80 tell fast

Answer 1

Answer:

$a= -5\\a= 4$

Step-by-step explanation:

$4a^{2} + 4a-80$

First of all simplify the equation by dividing the equation by 4

We'll get:

$a^{2} + a- 20$

Now using the Splitting the middle term method we'll get:

$a^{2} + 5a-4a-20\\a(a+5)-4(a+5)\\(a+5)(a-4)$

$a= -5\\a= 4$

♦Hope it helps♦

Answer 2

Answer:

a = -5

a = 4

Step-by-step explanation:

4a2+4a−80

First of all simplify the equation by dividing the equation by 4

We'll get:

a^{2} + a- 20a2+a−20

Now using the Splitting the middle term method we'll get:

\begin{gathered}a^{2} + 5a-4a-20\\a(a+5)-4(a+5)\\(a+5)(a-4)\end{gathered}a2+5a−4a−20a(a+5)−4(a+5)(a+5)(a−4)

\begin{gathered}a= -5\\a= 4\end{gathered}a=−5a=4