THE FORMULAS OF ABRIDGED MULTIPLICATION

A

100

(x-3)(x+4)

x²+x-12

200

tell me the squares of numbers from 5 to 13

5²=25

6²=36

7²=49

8²=64

9²=81

10²=100

11²=121

12²=144

13²=169

300

25x²-36y²

(5x-6y)(5x+6y)

400

0,64 - 1/9z²

(0,8 - 1/9z)(0,8 + 1/9z)

500

tell me the squares of numbers from 13 to 15

13²=169

14²=196

15²=225

B

100

(x+6)²

x²+12x+36

200

you are lucky

you are lucky

300

(1/7+x)(1/7-x)

1/49-x²

400

(n/4+m/3)²

n²/16+2*n/4*m/3+m²/9

500

(-4a+3b)(3b+4a)

9b²-16a²

C

100

x²+18x+81

(x+9)²

200

(3m-4k)²

9m²-24mk+16k²

300

(3/5+5k)²

9/25+6k+25k²

400

(z²-y)²

z⁴-2z²y+y²

500

tell me the squares of numbers from 15 to 20

15²=225

16²=256

17²=289

18²=324

19²=361

20²=400