oblicz:
(3+x)(3-x)
(7x-y)(7x+y)
(3-pierwiastek z 3)(3+pierwiastek z 3)
(2 pierwiastki z 2-4)(2 pierwiastki z 2+4)
(3+x)(3-x) = 3²-x² = 9-x²
(7x-y)(7x+y) = 49x²-y²
(3-√3)(3+√3) = 3²-(√3)² = 9-3 = 6
(2√2-4)(2√2+4) = (2√2)²-4² = 8-16 = -8
(a+b)(a-b) = a²-b²
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(3+x)(3-x) = 3²-x² = 9-x²
(7x-y)(7x+y) = 49x²-y²
(3-√3)(3+√3) = 3²-(√3)² = 9-3 = 6
(2√2-4)(2√2+4) = (2√2)²-4² = 8-16 = -8
(a+b)(a-b) = a²-b²