Question

factorise - 5 x power 2 - X + 4​

Answer 1

Step-by-step explanation:

Some books will encourage you to switch variables. Using the above example, they'd have you plugging, say, a "y" in the original expression, in place of the "x2", so you'd convert the original polynomial to:

y2 – 2y – 8

After this substitution, the result is clearly a quadratic, which easily factors as:

(y – 4)(y + 2)

Then you'd be expected to back-substitute the "x2" for the "y" to get:

(x2 – 4)(x2 + 2)

The entire process would look like this:

x4 – 2x2 – 8

(x2)2 – 2(x2) – 8

y2 – 2y – 8

(y – 4)(y + 2)

(x2 – 4)(x2 + 2)

Answer 2

5x²-x+4

5x²+4x-5x+4

5x(x-1)+4(x-1)

x=1,-4/5.....

HOPE IT'S HELPFUL...