factor completely. factor out the GCF first. then apply either the difference of 2 squares method or trial and error
1.2n^2+18n+28
2.3x^2-12x-15
3.5x^2-20x+20
4.2x^2-30x+100
5.3x^2-21x+30
6.10n^2+60n+80
7.4x^2+24x+32
8.2x^2+2x-4
9.x^3+7x^2+6x
10.5x^2-20
11.x^3-20
12.x^4-9x^2
13.y^4-4y^2
14.x^3-49x

Question

factor completely. factor out the GCF first. then apply either  the difference of 2 squares method or trial and error
1.2n^2+18n+28
2.3x^2-12x-15
3.5x^2-20x+20
4.2x^2-30x+100
5.3x^2-21x+30
6.10n^2+60n+80
7.4x^2+24x+32
8.2x^2+2x-4
9.x^3+7x^2+6x
10.5x^2-20
11.x^3-20
12.x^4-9x^2
13.y^4-4y^2
14.x^3-49x

anonymous · Answer

#1
2n^2+18n+28 =0
2 * (n^2 + 9n +14) = 0
2* (n+2) * (n+7) =0
=====> n= -2 or n= -7

anonymous · Answer

#2.
3x^2-12x-15 =0
3 * ( x^2 -4x -5 ) =0
3 * (x+1) * (x-4) = 0
====> x =-1 or x =4

anonymous · Answer

#3.
5x^2-20x+20 =0
5 * ( x^2 -4x +4) =0
5*( x-2)*(x-2) =0
=====> x =2