A. (2x+1)2= B. (10x-1)2= C. (3x+7)2= D. (x2-5).(4x2+1)= E. (2y-9).(2y+9)= F. (2d+1).(5d-1)= G. (x-3).(x+1)= H. (2a+3b) (5a2+2ab+b2)= I. (x2-4) (2x2+x+3y)= J.

Semoga jawabannya membantu :)

A. (2x+1)²
= (2x+1) (2x+1)
= (2x.2x) + (2x.1) + (1.2x) + (1.1)
= 4x² + 2x + 2x + 1
= 4x² + 4x + 1

B. (10x-1)²
= (10x-1) (10x-1)
= (10x.10x) + (10x.-1) + (-1.10x) + (-1.-1)
= 100x² - 10x - 10x + 1
= 100x² - 20x + 1

C. (3x+7)²
= (3x+7) (3x+7)
= (3x.3x) + (3x.7) + (7.3x) + (7.7)
= 9x² + 21x + 21x + 49
= 9x² + 42x + 49

D. (x²-5) (4x²+1)
= (x².4x²) + (-5.4x²) + (1.x²) + (1.-5)
= 4x⁴ - 20x² + x² - 5
= 4x⁴ - 19x² - 5

E. (2y-9) (2y+9)
= (2y.2y) + (2y.9) + (-9.2y) + (-9.9)
= 4y² + 18y - 18y - 18
= 4y² - 18

F. (2d+1) (5d-1)
= (2d.5d) + (2d.-1) + (1.5d) + (1.-1)
= 10d² - 2d + 5d - 1
= 10d² + 3d - 1

G. (x-3) (x+1)
= (x.x) + (x.1) + (-3.x) + (-3.1)
= x² + x - 3x - 3
= x² - 2x - 3

H. (2a+3b) (5a²+2ab+b²)
= (2a.5a²) + (2a.2ab) + (2a.b²) + (3b.5a²) + (3b.2ab) + (3b.b²)
= 10a³ + 4a²b + 2ab² + 15a²b + 6ab² + 3b³
= 10a³ + 19a²b + 8ab² + 3b³

I. (x²-4) (2x²+x+3y)
= (x².2x²) + (x².x) + (x².3y) + (-4.2x²) + (-4.x) + (-4.3y)
= 2x⁴ + x³ + 3x²y - 8x² - 4x - 12y

J. (a-5)² + (a-1)
= ((a-5)(a-5)) + (a-1)
= ((a.a)+(a.-5)+(-5.a)+(-5.-5)) + (a-1)
= a² - 5a - 5a + 25 + a - 1
= a² - 9a + 24

K. (x+4)² + (x+2)²
= ((x+4)(x+4)) + ((x+2)(x+2))
= ((x.x)+(x.4)+(4.x)+(4.4)) + ((x.x)+(x.2)+(2.x)+(2.2))
= x² + 4x + 4x + 16 + x² + 2x + 2x + 4
= 2x² + 12x + 20


Maaf jika ada kesalahan ^^