Question

Using (x + a) (x + b) = x2 + (a + b)x + ab, find

(i) 4.1 × 4.2​

Answer 1

Answer:

9.22( mark as brainliest )

Step-by-step explanation:

(x + a) (x + b) = x2 + (a + b)x + ab

4.1 x 4.2

= (4+0.1) x (4+0.2)= 4x2 + (0.1+0.2)x4 +0.1x0.2

                            = 8 + 1.2 + 0.02

                            = 9.22