Question

1) х²-25=
2) 36-16у²=
3)4х²-81у²=
разложить на множители
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Answer 1

$1) x^{2} -25=x^{2} -5^{2} =(x-5)*(x+5)\\2) 36-16y^{2} = 4(9-4y^{2} )=4(3-2y)*(3+2y)\\3) 4x^{2} -81y^{2} = 2^{2} x^{2} -9^{2} y^{2} =(2x)^{2}-(9y)^{2}=(2x-9y)*(2x+9y)$