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6x3+5x2+6x-8
= 6x3-4x2+9x2-6x+12x-8
=2x2.(3x-2)+3x.(3x-2)+4.(3x-2)
=(3x-2)(2x2+3x+4)
a) x2 + 6x + 9 = x2 + 2 . x . 3 + 32 = (x + 3)2
b) 10x – 25 – x2 = -(-10x + 25 +x2) = -(25 – 10x + x2)
= -(52 – 2 . 5 . x – x2) = -(5 – x)2
c) 8x3 - 1/8 = (2x)3 – (1/2)3 = (2x - 1/2)[(2x)2 + 2x . 12 + (1/2)2]
= (2x - 1/2)(4x2 + x + 1/4)
d)1/25x2 – 64y2 = (1/5x)2(1/5x)2- (8y)2 = (1/5x + 8y)(1/5x - 8y)
a. \(5x^2-6x+1\)
=\(5x^2-x-5x+1\)
\(=\left(x-1\right)\left(5x-1\right)\)
a. 5x^2-6x+15x2−6x+1
=5x^2-x-5x+15x2−x−5x+1
=\left(x-1\right)\left(5x-1\right)=(x−1)(5x−1)
a, \(5y^2-5x^2+6x+6y=5\left(y-x\right)\left(x+y\right)+6\left(x+y\right)\)
\(=\left(x+y\right)\left(5y-5x+6\right)\)
b, \(12x^2+19x+7=12x^2+12x+7x+7\)
\(=12x\left(x+1\right)+7\left(x+1\right)=\left(12x+7\right)\left(x+1\right)\)
a) xy+3x-7y-21
=x(y+3)-7(x+3)
=(x-7)(y+3)
b)2xy-15-6x-5y
=2x(y-3)-5(-3+y)
=(2x-5)(y-3)
c)2x^2y+2xy^2-2x-2y
=2x(xy-1)+2y(xy-1)
=(2x+2y)(xy-1)
x(x+3)-5x(x-5)-5(x+3)
=(x-5)(x+3)-5x(x-5)
=(x-5)(x+3-5x)
Câu cuối mình bị nhầm dòng cuối phải là (x-5)(x+3+x-5)=(x-5)(2x-2)nha bạn
6x3 + 5x2 - 7x - 4
= (6x3 + 5x - 7x) - 4
= x (6x2 - 5 - 7) - 22
= x (6x2 - 12) - 22
= x [6 (x2 - 2)] - 22
= x [6 (x2 - \(\sqrt{2}^2\))] - 22
= x [6 (x +\(\sqrt{2}\)) (x -\(\sqrt{2}\))] - 22
= (x - 22) [6 (x +\(\sqrt{2}\)) (x -\(\sqrt{2}\))
b) 2x3 - x2 + x - 2
= (2x3 - x2 - x) - 2
= x (2x2 - x - 1) - 2
= (x - 2) (2x2 - x - 1)
(mik ko biet dug ko, neu sai mog bn thog cam)
\(5x^2-6x+1=5x^2-5x-x+1=5x\left(x-1\right)-\left(x-1\right)\)
\(=\left(x-1\right)\left(5x-1\right)\)