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A=x² +10x+25=(x+5)²
B=36-81b²=(6-9b)(6+9b)
C=3n(n+8)+3n(7+3n)=3n(n+8+7+3n)=3n(4n+15)
D=100-60a+9a²=(10-3a)²
E=(3x-7)(2x+9)-(5x+3)(3x-7)=(3x-7)(2x+9-5x-3)=(3x-7)(-3x+6)
F=49-(5t+8)²=7²-(5t+8)²=(7+5t+8)(7-(5t+8))=(5t+15)(-5t-1)=-5(t+3)(5t+1)
G=(x+4)²=x²+16+8x
H=3a(7a-9)=21a²-27a
I=(3+b)(2b-7)=6b-21+2b²-7b=2b²-b-21
J=(8-5t)²=64+25t²-80t
K=(6-10x)(6+10x)=36-100x²
B=36-81b²=(6-9b)(6+9b)
C=3n(n+8)+3n(7+3n)=3n(n+8+7+3n)=3n(4n+15)
D=100-60a+9a²=(10-3a)²
E=(3x-7)(2x+9)-(5x+3)(3x-7)=(3x-7)(2x+9-5x-3)=(3x-7)(-3x+6)
F=49-(5t+8)²=7²-(5t+8)²=(7+5t+8)(7-(5t+8))=(5t+15)(-5t-1)=-5(t+3)(5t+1)
G=(x+4)²=x²+16+8x
H=3a(7a-9)=21a²-27a
I=(3+b)(2b-7)=6b-21+2b²-7b=2b²-b-21
J=(8-5t)²=64+25t²-80t
K=(6-10x)(6+10x)=36-100x²
Factorisations
A = x² +10x+25 = (x+5)²
B = 36-81b² =(6-9b)(6+9b)
C = 3n(n+8)+3n(7+3n) = 3n(n+8+7+3n) = 3n(4n+15)
D =100 -60a +9a² = (10-3a)²
E =(3x-7)(2x+9) - (5x+3)(3x-7) = (3x-7)(2x+9-5x-3) = (3x-7)(-3x+6)
F = 49 - (5t+8)² = 7²- (5t+8)² = (7+5t+8)(7-(5t+8)) = (5t+15)(-5t-1) = -5(t+3)(5t+1)
Développements
G = (x+4)² = x² +16 +8x
H = 3a(7a-9) = 21a² -27a
I = (3+b)(2b-7) = 6b-21+2b² -7b = 2b²-b-21
J = (8-5t)² = 64 +25t² -80t
K = ( 6-10x)(6+10x) =36 -100x²
A = x² +10x+25 = (x+5)²
B = 36-81b² =(6-9b)(6+9b)
C = 3n(n+8)+3n(7+3n) = 3n(n+8+7+3n) = 3n(4n+15)
D =100 -60a +9a² = (10-3a)²
E =(3x-7)(2x+9) - (5x+3)(3x-7) = (3x-7)(2x+9-5x-3) = (3x-7)(-3x+6)
F = 49 - (5t+8)² = 7²- (5t+8)² = (7+5t+8)(7-(5t+8)) = (5t+15)(-5t-1) = -5(t+3)(5t+1)
Développements
G = (x+4)² = x² +16 +8x
H = 3a(7a-9) = 21a² -27a
I = (3+b)(2b-7) = 6b-21+2b² -7b = 2b²-b-21
J = (8-5t)² = 64 +25t² -80t
K = ( 6-10x)(6+10x) =36 -100x²
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