Question

find the answer and explain it step by step, please guys help me I need to now the answer please...... ​

Answer 1

i could answer only this as i am tired now

Answer 2

Answer:

answers with explanation

Step-by-step explanation:

1. (xy+32)^2                                                          (∵$(a+b)^2 = a^2+2ab+b^2$)

=$(xy)^2+2*32*xy + (32)^ 2$ $x^2y^2+64xy+1024$  

2. (7m-8n)^2+ (7m+8n)^2

=$(7m)^2 + (8n)^2$ = 49$m^2$ + 64$n^2$                        (∵$(a+b)^2+(a-b)^2 = a^2+b^2$)

3. 297*303 = (300-3)(300+3) = $300^2-3^2$ = 90000-9  (∵(a+b)(a-b)=$a^2-b^2$)

= 90000-9 = 89991

4. (100+2)^2 = 10000+4+400  =10404               (∵$(a+b)^2 = a^2+2ab+b^2$)

5. 12.1^2-7.9^2                                                   (∵(a+b)(a-b)=$a^2-b^2$)

=(12.1+7.9)(12.1-7.9) = (20)*(4.2) = 84

6. 103*98

=(100+3)(100-2)                                   (∵$(x+a)(x-b) = x^2 + (a - b)x - ab.$)

=100^2+(3-2)100 -3*2

=10000+100-6 = 10094