What is expand ((x+1)(x-1))*((x+2)(x-2)) ?

The solution to expand ((x+1)(x-1))*((x+2)(x-2)) is x^4-5x^2+4

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expand ((x+1)(x-1))*((x+2)(x-2))

expand

((x + 1) (x - 1)) \cdot ((x + 2) (x - 2))

x^{4} - 5 x^{2} + 4

Solution steps

((x + 1) (x - 1)) ((x + 2) (x - 2))

Remove parentheses:

(a) = a

= (x + 1) (x - 1) (x + 2) (x - 2)

Expand

(x + 1) (x - 1) : x^{2} - 1

= (x^{2} - 1) (x + 2) (x - 2)

Expand

(x + 2) (x - 2) : x^{2} - 4

= (x^{2} - 1) (x^{2} - 4)

Expand

(x^{2} - 1) (x^{2} - 4) : x^{4} - 5 x^{2} + 4

= x^{4} - 5 x^{2} + 4

\frac{x + h - 1}{( x + h ) ^{2} + 2}

\frac{20}{s ( s + 12 ) + 4}

\frac{e ^{\frac{n ( n + 1 )}{2}}}{n}

f (5 a = 5 a - 2)

x (x^{3} - 9 x - 7 = 0)

What is expand ((x+1)(x-1))*((x+2)(x-2)) ?
The solution to expand ((x+1)(x-1))*((x+2)(x-2)) is x^4-5x^2+4