Question

Efectuati, utilizand formula
$(a - b) {}^{2} = a {}^{2} - 2ab + b {}^{2}$
+ex 3 si 4​

Answer 1

(x-4x)²=x²-4x+8x²

(5a-6m)²=25a²-60am+36m²

(2z-10t)²=4z²-40zt+100t²

(11x-3y)²=121x²-66xy+9y²

(4x-7b)²=16x²-56xb+49b²

3.

(x+2)(x-2)=x²-4

(a+3)(a-3)=a²-9

(5+x)(5-x)=25-x²

(4a-2c)(4a+2c)=16a²-4c²

(2x+1)(2x-1)=2x²-1

(2y-5x)(2y+5x)=4y²-25x²

(m+3n)(m-3n)=m²-9n²

(t+2z)(t-2z)=t²-4z²

(12a-x)(12a+x)=144a²-x²

4.(3x+4)²=9x²+24x+16

(2x-7z)²=4x²-28xz+49z²

(7b-8x)(7b+8x)=49b²-64x²

Answer 2

..................coroana?