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Ta có : x4 + 2018x2 + 2017x + 2018
= x4 - x + 2018x2 + 2018x + 2018
= x(x3 - 1) + 2018(x2 + x + 1)
= x(x - 1)(x2 + x + 1) + 2018(x2 + x + 1)
= (x2 + x + 1)(x2 - x + 2018)
a) \(3x^2+8x-11\)
\(=3x^2-3+11x-11\)
\(=\left(3x^2-3x\right)+\left(11x-11\right)\)
\(=3x\left(x-1\right)+11\left(x-1\right)\)
\(=\left(x-1\right)\left(3x+11\right)\)
b) \(x^4+2018x^2-2017x+2018\)
\(=\left(x^4+x\right)+\left(2018x^2-2018x+2018\right)\)
\(=x\left(x^3+1\right)+2018\left(x^2-x+1\right)\)
\(=x\left(x+1\right)\left(x^2-x+1\right)+2018\left(x^2-x+1\right)\)
\(=\left(x^2-x+1\right)\left[x\left(x+1\right)+2018\right]\)
\(=\left(x^2-x+1\right)\left(x^2+x+2018\right)\)
\(=\left(x^2-x+1\right)\left(x^2+x+2018\right)\)
a) 3x2 + 8x - 11
=3x2+11x-3x-11
=x(3x+11)-(3x+11)
= (x-1)(3x+11)
\(x^4+2019x^2+2018x+2019\)
\(=x^4-x^3+x^3+2019x^2-x^2+x^2+2019x-x+2019\)
\(=\left(x^4-x^3+2019x^2\right)+\left(x^3-x^2+2019x\right)+\left(x^2-x+2019\right)\)
\(=x^2\left(x^2-x+2019\right)+x\left(x^2-x+2019\right)+\left(x^2-x+2019\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2019\right)\)
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
\(49\left(x-4\right)^2-9\left(x+2\right)^2\)
\(=\left(7x-28\right)^2-\left(3x+6\right)^2\)
\(=\left(7x-28-3x-6\right)\left(7x-28+3x+6\right)\)
\(=\left(4x-34\right)\left(10x-22\right)\)
\(=4\left(2x-17\right)\left(5x-11\right)\)
a,\(x^5-x^4-x^4+x^3+2x^3-2x^2-2x^2+2\)2x-2x+2\(x^4\left(x-1\right)-x^3\left(x-1\right)+2x^2\left(x-1\right)-2x\left(x-1\right)+2\left(x-1\right)\)
=\(\left(x^4-x^3+2x^2-2x+2\right)\left(x-1\right)\)
b,
\(x^4-4x^3+4x^2\)
\(=x^2\left(x^2-4x+4\right)\)
\(=x^2\left(x-2\right)^2\)
\(3x^2+10x+3\)
\(=3x^2+x+9x+3\)
\(=x\left(3x+1\right)+3\left(3x+1\right)\)
\(=\left(x+3\right)\left(3x+1\right)\)
\(x^4-4x^3+4x^2\)
\(=x^2.\left(x^2-2.x.2+2^2\right)\)
\(=x^2.\left(x-2\right)^2\)
x4+2018x2+2017x+2018=x4+2018x2+2018x-x+2018
=x(x3-1)+2018(x2+x+1)=(x2+x+1)(x2-x+2018)
Ktra xem mk có nhầm chỗ nào ko nhé. Cảm ơn bạn
ko có j