Question

factorise x^4 - 7x^2 +9​

Answer 1

Step-by-step explanation:

I think in your questions there is 6x^2 otherwise answer won't come

Answer 2

Answer:

Let X^2 = m

So, Equation m^2 -7m+9

m = (-b +- √b^2-4ac)/2a

= (--7+- √7^2 -4*1*9)/2*1

= (7+- √49-36)/2

m= (7+√13)/2 or m = (7-√13)/2

= (7+3.60)/2 or (7-3.60)/2

m = 5.30 or 1.7

but X^2 = m

X^2= 5.30 and X^2=1.7

X=√5.30 = +2.30 and -2.30

X=√1.7 = +1.30 and -1.30

So finally, X= 2.30, -2.30, 1.30, -1.30