Question

factorise 20 X square + 13 x minus 21​

Answer 1

Answer:

plzz give me brainliest ans and plzzzz follow me

Answer 2

Answer:

(5x+7)(4x-3)

Step-by-step explanation:

Let p(x)= 20$x^{2}$+13x-21

Now, using 'Splitting The Middle Term Method' we will find the product of the First & the Last term.

So, Product of 20$x^{2}$ & (-21) is (-420$x^{2}$)

Now Dividing (-420$x^{2}$), We Get that it's factors are 28x & -15x

The sum of these factors is 28x-15x=13x that is equal to the middle value

Now Put this value in p(x)

p(x)= 20$x^{2}$ +28x-15x-21

p(x)=4x(5x+7)-3(5x+7)

p(x)=(5x+7)(4x-3)