Phân tích đa thức thành nhân tử
16 ( 2x + 3 )2 - 9 ( 5x - 2 ) 2
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\(16\cdot\left(2x+3\right)^2-9\cdot\left(5x-2\right)^2\\ =\left(8x+12\right)^2-\left(15x-6\right)^2\\ =\left(8x+12-15x+6\right)\left(8x+12+15x-6\right)\\ =\left(-7x+18\right)\left(23x+6\right)\)
8: \(=\left(x-2y\right)\cdot x\cdot\left(x+3\right)\)
9: \(=\left(5x+2\right)\left(x-3\right)-x\left(x-3\right)\)
\(=\left(x-3\right)\left(4x+2\right)\)
=2(2x+1)(x-3)
3: \(=2\left(x+2\right)\left(25x-15-x\right)\)
\(=2\left(x+2\right)\left(24x-15\right)\)
=6(x+2)(8x-5)
\(x^4-5x^2+4=\left(x^2-4\right)\left(x^2-1\right)=\left(x-2\right)\left(x+2\right)\left(x-1\right)\left(x+1\right)\)
\(=2x^2-6x+x-3=\left(x-3\right)\left(2x+1\right)\)
\(=2x^2-6x+x-3=2x\left(x-3\right)+\left(x-3\right)=\left(2x+1\right)\left(x-3\right)\)
= 2x^2 - x + 6x - 3
= x(2x - 1) + 3(2x - 1)
= (x + 3)(2x - 1)
\(2x^2+5x-3\)
\(=2x^2+6x-x-3\)
\(=2x\left(x+3\right)-\left(x+3\right)\)
\(=\left(2x-1\right)\left(x+3\right)\)
\(-2x^2+5x+3\)
\(=-2x^2+6x-x+3\)
\(=-2x\left(x-3\right)-\left(x-3\right)\)
\(=\left(x-3\right)\left(-2x-1\right)\)
e ko bt phân tích đa thức thành nhân tử nên a tham khảo linh này nha
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\(16\left(2x+3\right)^2-9\left(5x-2\right)^2\)
\(=\left[4\left(2x+3\right)\right]^2-\left[3\left(5x-2\right)\right]^2\)
\(=\left[4\left(2x+3\right)-3\left(5x-2\right)\right]\left[4\left(2x+3\right)+3\left(5x-2\right)\right]\)
\(=\left(-7x+18\right)\left(23x+6\right)\)