Question

(x + 3) (x – 3) (x + 4) (x – 4)

pls tell the answer ​

Answer 1

• (x+3)(x-3)(x+4)(x-4)
• (x2-3x+3x-9)(x2-4x+4x-16)
• (x2-9)(x2-16). from here there is another way but I don't knowanother way
• x4-16x2-9x2+144
• x4-25x2+144

Answer 2

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$(x + 3) (x – 3) (x + 4) (x – 4)$

Step1:

Solving : (x + 3) (x – 3)

Indentity : (a+b)(a-b) = a² - b²

= (x + 3) (x – 3)

= (x)² - (3)²

= x² - 9

Step2:

Solving : (x + 4) (x – 4)

Indentity : (a+b)(a-b) = a² - b²

= (x + 4) (x – 4)

= (x)² - (4)²

= x² - 16

Now,

Solve

= (x² - 9)(x² - 16)

= x²(x² - 16) -9(x² - 16)

= x⁴ - 16x² -9x² + 144

= x⁴ - 25x² + 144

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