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NT
5
6 tháng 8 2016
\(x^2-9-4\left(x+3\right)\)
\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)
\(=\left(x+3\right)\left(x-3-4\right)\)
\(=\left(x+3\right)\left(x-7\right)\)
6 tháng 8 2016
x2 - 9 - 4(x + 3)
= (x2 - 9) - 4(x + 3)
= (x2 - 32) - 4(x + 3)
= (x - 3) (x + 3) - 4(x + 3)
= (x + 3) (x - 3 - 4)
= (x + 3) ( x - 7)
ko bít đúng ko !! 547467474856856856856835675743634634645765876976946426436
HQ
0
NM
3
KT
8 tháng 8 2018
\(9\left(x-3\right)^2-4\left(x+1\right)^2\)
\(=\left[3\left(x-3\right)-2\left(x+1\right)\right].\left[3\left(x-3\right)+2\left(x+1\right)\right]\)
\(=\left(3x-9-2x-2\right)\left(3x-9+2x+2\right)\)
\(=\left(x-11\right)\left(5x-7\right)\)
8 tháng 8 2018
\(9\left(x-3\right)^2-4\left(x+1\right)^2\)
\(=3^2\left(x-3\right)^2-2^2\left(x+1\right)^2\)
\(=\left[3\left(x-3\right)\right]^2-\left[2\left(x+1\right)\right]^2\)
\(=\left[3x-9\right]^2-\left[2x+2\right]^2\)
\(=\left[3x-9-2x-2\right].\left[3x-9+2x+2\right]\)
\(=\left(x-11\right)\left(5x-7\right)\)
Chúc bạn học tốt.
TT
1
TM
17 tháng 9 2017
\(9\left(x-3\right)^2-4\left(x-1\right)^2=\left(3x-9\right)^2-\left(2x-2\right)^2\)
\(=\left[\left(3x-9\right)-\left(2x-2\right)\right]\left[\left(3x-9\right)+\left(2x-2\right)\right]\)
\(=\left(3x-9-2x+2\right)\left(3x-9+2x-2\right)\)
\(=\left(x-7\right)\left(5x-11\right)\)
NN
1
4 tháng 1 2019
\(x^4+4x^3-2x^2-12x+9\)
\(=x^4+3x^3+x^3+3x^2-5x^2-15x+3x+9\)
\(=x^3\left(x+3\right)+x^2\left(x+3\right)-5x\left(x+3\right)+3\left(x+3\right)\)
\(=\left(x+3\right)\left(x^3+x^2-5x+3\right)\)
\(=\left(x+3\right)\left(x^3+3x^2-2x^2-6x+x+3\right)\)
\(=\left(x+3\right)\left[x^2\left(x+3\right)-2x\left(x+3\right)+\left(x+3\right)\right]\)
\(=\left(x+3\right)\left(x+3\right)\left(x^2-2x+1\right)\)
\(=\left(x+3\right)^2\left(x-1\right)^2\)
NV
1
13 tháng 8 2021
\(\left(x+3\right)^2-16\)
\(=\left(x+3-4\right)\left(x+3+4\right)\)
\(=\left(x-1\right)\left(x+7\right)\)
AH
1
PH
4
LC
20 tháng 9 2018
\(49\left(x-4\right)^2-9\left(x+2\right)^2\)
\(=\left(7x-28\right)^2-\left(3x+6\right)^2\)
\(=\left(7x-28-3x-6\right)\left(7x-28+3x+6\right)\)
\(=\left(4x-34\right)\left(10x-22\right)\)
\(=4\left(2x-17\right)\left(5x-11\right)\)
\(x^2-9-4\left(x+3\right)\)
\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)
\(=\left(x+3\right)\left(x-3-4\right)\)
\(=\left(x+3\right)\left(x-7\right)\)
\(x^2-9-4\left(x+3\right)\)
\(=\left(x^2-9\right)-4\left(x+3\right)\)
\(=\left(x^2-3^2\right)-4\left(x+3\right)\)
\(=\left(x-3\right)\left(x+3\right)-4\left(x+3\right)\)
\(=\left(x+3\right)\left(x-3-4\right)\)
\(=\left(x+3\right)\left(x-7\right)\)