Question

Evaluate : b^2 - 9 ( b - 1 ) ^ 2 . if b = 1.1 . ( hint . put b = 1.1 = 11/10

Answer 1

(b+3b-3)(b-3b+3)
(4b-3)(3-2b)
(4×1.1-3)(3-2×1.1)
(4.4-3)(3-2.2)
1.4×7.8=0.7×15.6=10.92