Question

Without actual multiplication find square of a)86 b)71l​

Answer 1

Answer:

(A+B) all squar equal A squar+ B squar +2AB

Answer 2

• a)7396 b)5041

Step-by-step explanation:

a) Square of 86

Solution:

(86)² = (80 + 6)²

= (80)² + 2×80×6+ (6)²

= 6400 + 960 + 36

= 7396

b) Square of 71

Solution:

(71)² = (70 + 1)²

= (70)² + 2×70×1 + (1)²

= 4900 + 140 + 1

= 5041

Formula applied:

(a+b)² = a² + 2ab + b²