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\(a^3+4a^2-7a-10\)
\(=\left(a^3+5a^2\right)-\left(a^2+5a\right)-\left(2a+10\right)\)
\(=a^2\left(a+5\right)-a\left(a+5\right)-2\left(a+5\right)\)
\(=\left(a^2-a-2\right)\left(a+5\right)\)
\(=\left(a^2-2a+a-2\right)\left(a+5\right)\)
\(=\left[a\left(a-2\right)+\left(a-2\right)\right]\left(a+5\right)\)
\(=\left(a+1\right)\left(a-2\right)\left(a+5\right)\)
b. \(\left(a^2+a\right)+a\left(a^2+a\right)-12\)
<=>\(\left(x^3+3x^2-4\right)+\left(3x^2+9x-12\right)\)
<=>\(x\left(x^2+3x-4\right)+3\left(x^2+3x-4\right)\)
<=>\(\left(x^2+3x-4\right)\left(x+3\right)\)
<=>\(\left(x+3\right)\left(x^2+4x\right)-\left(x-4\right)\)
đóngmở ngoặc nhé mk ngại ghi lại
<=>(x+3)(x(x+4)-(x+4))
<=>(x+3)(x-1)(x+4)
kết pn fb mk nhé longtrangv@gmail.com
c) \(x^3-x^2-4x^2+8x-4\)
= \(x^3-x^2-4x^2+4x+4x-4\)
= \(x^2\left(x-1\right)-4x\left(x-1\right)+4\left(x-1\right)\)
= \(\left(x-1\right)\left(x^2-4x+4\right)\)
= \(\left(x-1\right)\left(x-2\right)^2\)
\(=7\left(a-b\right)+\left(a-b\right)\left(a+b\right)=\left(a-b\right)\left(7+a+b\right)\)
\(7a-7b+a^2-b^2\)
\(=7\left(a-b\right)+\left(a-b\right)\left(a+b\right)\)
\(=\left(a-b\right)\left(a+b+7\right)\)
\(a^3+4a^2+4a+3\)
\(=a^3+a^2+3a^2+3a+a+3\)
\(=\left(a^3+a^2+a\right)+\left(3a^2+3a+3\right)\)
\(=a\left(a^2+a+1\right)+3\left(a^2+a+1\right)\)
\(=\left(a+3\right)\left(a^2+a+1\right)\)
\(a.25^2-4a^2+12ab-9b^2\\ =25^2-\left(4a^2+12ab-9b^2\right)\\ =25^2-\left(2a-3b\right)^2\\ =\left(25-2a+3b\right)\left(25+2a-3b\right)\\ b.x^3+x^2y-xy^2-y^3\\ =x^2\left(x+y\right)-y^2\left(x+y\right)\\ =\left(x+y\right)\left(x^2-y^2\right)\\ =\left(x+y\right)\left(x+y\right)\left(x-y\right)\\ =\left(x+y\right)^2\left(x-y\right)\)
a: Ta có: \(25x^2-4a^2+12ab-9b^2\)
\(=25x^2-\left(2a-3b\right)^2\)
\(=\left(5x-2a+3b\right)\left(5x+2a-3b\right)\)
b: Ta có: \(x^3+x^2y-xy^2-y^3\)
\(=\left(x-y\right)\left(x^2+xy+y^2\right)+xy\left(x-y\right)\)
\(=\left(x-y\right)\left(x+y\right)^2\)
\(4a^2-4a+1-4b^2\)
<=>\(\left(2a-1\right)^2-4b^2\)
<=>\(\left(2a-1+2b\right)\left(2a-1-2b\right)\)
\(4a^2-4a+1-4b^2\)
\(=\left(2a-1\right)^2-4b^2\)
\(=\left(2a-1+2b\right)\left(2a-1-2b\right)\)
\(a^3+4a^2-7a-10\)
\(=a^3+3a^2+a^2-10a+3a-10\)
\(=\left(a^3+a^2\right)+\left(3a^2+3a\right)-\left(10a+10\right)\)
\(=a^2\left(a+1\right)+3a\left(a+1\right)-10\left(a+1\right)\)
\(=\left(a+1\right)\left(a^2+3a-10\right)\)
\(=\left(a+1\right)\left[\left(a^2+5a-2a-10\right)\right]\)
\(=\left(a+1\right)\left[a\left(a+5\right)-2\left(a+5\right)\right]\)
\(=\left(a+1\right)\left(a+5\right)\left(a-2\right)\)
a(b+c)^2+b(c+a)^2+c(a+b)^2-4abc