Question

mental mathmatics work ans please ​

Answer 1

Answer.

(1).

i. (7)^2 = 49

ii. (12)^2 = 144

iii. (2.5)^2 = 6.25

iv. (1.2)^2 = 1.44

v. (1/4)^2 = 1/16

vi. (4/9)^2 = 16/81

(2).

ans. 36 , 169 , 625

(3).

ans. 144 , 64 , 400

(4).

i. (26)^2 - (16)^2 = (26-16)(26+16)

= (10)(42)

= 420

ii. (35)^2 - (11)^2 = (35-11)(35+11)

= (24)(46)

= 1104

iii. (48)^2 - (40)^2 = (48-40)(48+40)

= (8)(88)

= 704

iv. (65)^2 - (64)^2 = (65-64)(65+64)

= (1)(129)

= 129

v. (121)^2 - (120)^2 =(121-120)(121+120)

=(1)(241)

= 241

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Answer 2

Answer:

1.(i)49

(ii)144

(III)6.25

(iv)1.44

(v)1/16

(vi)16/81

2.36,169 and 625 are perfect squares

3.144,64,400 are the square of even number

4.(I)840

(II)1104

(III)708

(Iv)129

(v)241

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