Question

(3.5m + 1.5n) (3.5m – 1.5n) ​

Answer 1

Answer:

(iii) (3.5m – 1.5n)(3.5m + 1.5n)

= (3.5m)2 – (1.5n)2 {∵ (a – b)(a + b) = a2 – b2}

= 12.25m2 – 2.25n2

Answer 2

Answer:

12.25m-2.25

Step-by-step explanation:

(3.5m)2-(1.5n)2             [using (a-b)(a+b)=a2-b2]

= 12.25m-2.25n